Research papers include:
{1.} The generalized spectral radius, numerical radius and spectral norm (with T.Y. Tam and N.K. Tsing), Linear and Multilinear Algebra 16 (1984), 215-237. [MR 86c:15015]
{2.} A note on Miranda's results about the characteristic values and three types of singular values of a complex matrix, Linear and Multilinear Algebra 16 (1984), 297-303. [MR 87g:15020]
{3.} On the extremal solutions for capacitated network problems, Linear and Multilinear Algebra 18 (1985), 117-125. [MR 817 655]
{4.} Characterization of doubly superstochastic matrices by network flows (with C.K. Chu), Int. J. Math. Sci. Technol. 17, No. 1 (1986), 127-129.
{5.} The decomposable numerical radius and numerical radius of a compound matrix, Linear Algebra Appl. 76 (1986), 45-58. [MR 87g:15037]
{6.} On the higher numerical radius and spectral norm, Linear Algebra Appl. 80 (1986), 55-70. [MR 88d:15032]
{7.} The $c$-spectral, $c$-radial and $c$-convex matrices, Linear and Multilinear Algebra 20 (1986), 5-15. [MR 88a:15048]
{8.} N-color mapping theorem (with M.K. Siu and K.M. Tsang), Hong Kong Assoc. for Sci. and Math. Bulletin 11 (1986), 1-5.
{9.} A generalization of spectral radius, numerical radius and spectral norm, Linear Algebra Appl. 90 (1987), 105-118. [MR 88f:15042]
{10.} Linear operators preserving the numerical radius of matrices, Proc. of Amer. Math. Soc. 99, No. 4 (1987), 601-608. [MR 87m:15004]
{11.} On unitarily invariant norms and related results (with N.K. Tsing), Linear and Multilinear Algebra 20 (1987), 107-119. [MR 88c:15015]
{12.} An inequality on elementary symmetric functions, Linear and Multilinear Algebra 20 (1987), 373-375.[MR 88g:26015]
{13.} Linear operators that preserve the m-numerical radius or the m-numerical range of matrices: results and questions, Current Trends in Matrix Theory, North-Holland, New York, 1987. [MR 898 907]
{14.} Linear operators preserving the higher numerical radius of matrices, Linear and Multilinear Algebra 21 (1987), 63-73. [MR 88f:15043]
{15.} The $C$-convex matrices, Linear and Multilinear Algebra 21 (1987), 303-312. [MR 89b:1503]
{16.} Matrices with some extremal properties, Linear Algebra Appl. 101 (1988), 255-267. [MR 89c:15025]
{17} The $C$-convex matrices (in The 1987 Utah State University Matrix Theory Conference Report), Linear Algebra Appl. 104 (1988), 219-221.
{18.} Linear operators that preserve the $c$-numerical range or radius of matrices (with N.K. Tsing), Linear and Multilinear Algebra 23 (1988), 27-46. [MR 89f:15020]
{19.} Some isometries of rectangular complex matrices (with N.K. Tsing), Linear and Multilinear Algebra 23 (1988), 47-53. [MR 89g:15031]
{20.} Additive decomposition of nonnegative matrices with applications to permanents and scaling (with S. Friedland and H. Schneider), Linear and Multilinear Algebra 23 (1988), 63-78. [MR 89j:15034]
{21.} Inequalities relating unitarily invariant norms and the numerical radius (with C.R. Johnson), Linear and Multilinear Algebra 23 (1988), 183-191.[MR 89i:15010]
{22.} Linear transformations on $M_n({\bf R})$ that preserve the Ky Fan k-norm and a remarkable special case when (n,k) = (4,2) (with C.R. Johnson and T.J. Laffey), Linear and Multilinear Algebra 23 (1988), 285-298.[MR 91b:15029]
{23.} Linear operators preserving the decomposable numerical radius (with N.K. Tsing), Linear and Multilinear Algebra 23 (1988), 333-341.[MR 90g:15041]
{24.} Duality between some linear preservers problems: The invariance of the $C$-numerical range, the $C$-numerical radius and certain matrix sets (with N.K. Tsing), Linear and Multilinear Algebra 23 (1988), 353-362. [MR 90m:15041]
{25.} Linear operators preserving the (p,q) numerical range (with B.S. Tam and N.K. Tsing), Linear Algebra Appl. 110 (1988), 75-89. [MR 89j:15040]
{26.} Duality between some linear preserver problems II: Isometries with respect to $c$-spectral norms and matrices with fixed singular values (with N.K. Tsing), Linear Algebra Appl. 110 (1988), 181- 212. [MR 90m:15042]
{27.} Polynomials and numerical ranges, Proc. of Amer. Math. Soc. 104, No. 2 (1988), 369-373.[MR 89k:15044]
{28.} Norms that are invariant under unitary similarities and the $C$-numerical radii (with N.K. Tsing), Linear and Multilinear Algebra 24 (1989), 209-222.[MR 90h:15036]
{29.} The numerical range of derivations (with N.K. Tsing), Linear Algebra Appl. 119 (1989), 97-119. [MR 90h:15013]
{30.} Distance to the convex hull of unitary orbit with respect to unitary similarity invariant norms (with N.K. Tsing), Linear and Multilinear Algebra 25 (1989), 93-103. [MR 90k:15011]
{31.} $G$-invariant hermitian forms and $G$-invariant elliptical norms (with N.K. Tsing), SIAM J. of Matrix Analysis Appl. 10 (1989), 435-445.[MR 90j:15036]
{32.} $c$-Convex matrices: Characterizations, inclusion relations and normality (with C.H. Sung and N.K. Tsing), Linear and Multilinear Algebra 25 (1989),275-287. [MR 90m:15043]
{33.} Linear operators preserving unitarily invariant norms of matrices (with N.K. Tsing), Linear and Multilinear Algebra 26 (1990), 119-132. [MR 91g:15017]
{34.} Linear operators preserving certain classes of functions on singular values of matrices (with N.K. Tsing), Linear and Multilinear Algebra 26 (1990), 133-143. [MR 91i:15012]
{35} On certain convex matrix sets, Discrete Mathematics 79 (1989/90), 323-326. [91h:15023]
{36.} Matrices for which $0 \notin F(A^m)$ (with C.R. Johnson), Linear and Multilinear Algebra 27 (1990), 57-62. [MR 91f:15054]
{37.} Norms on Cartesian product of linear spaces (with N.K. Tsing), Tamkang J. Math. 21 (1990), 35-39. [MR 91h:46028]
{38.} Linear operators preserving unitary similarity invariant norms on matrices (with N.K. Tsing), Linear and Multilinear Algebra 27 (1990), 213-224. [MR 91f:15055]
{39.} Some extremal problems for hermitian matrices and operators (with L. Rodman), Linear Algebra Appl.~140 (1990), 139-154. [MR 91m:15033]
{40.} Duality between some linear preserver problems III: $c$-spectral norms on (skew)-symmetric matrices and matrices with fixed singular values (with N.K. Tsing), Linear Algebra Appl.~143 (1991), 67-97. [MR 92b:15038]
{41.} On the $k^{th}$ matrix numerical range (with N.K. Tsing), Linear and Multilinear Algebra 28 (1991), 229-239.[MR 91k:15049]
{42.} Linear operators preserving certain equivalence relations on matrices (with R. Horn and N.K. Tsing), SIAM J. of Matrix Analysis and Appl. 12 (1991), 195-204. [MR 92b:15004]
{43.} Matrices with circular symmetry on their unitary orbits and $C$-numerical ranges (with N.K. Tsing), Proc. AMS 111 (1991), 19-28. [MR 91d:15054]
{44.} Some results on the generalized $k$-numerical range, Linear Algebra Appl. 146 (1991), 21-29. [MR 92a:15030]
{45.} $G$-invariant norms and $G(c)$-radii (with N.K. Tsing), Linear Algebra Appl. 150 (1991), 179-194.[MR 92c:15028]
{46.} Joint ranges of Hermitian matrices and simultaneous diagonalization (with P. Binding), Linear Algebra Appl. 151 (1991), 157-168. [MR 92d:47006]
{47.} Inequalities relating norms invariant under unitary similarities, Linear and Multilinear Algebra 29 (1991), 155-167. [MR 92i:15018]
{48.} The numerical range and decomposable numerical range of matrices (with N. Bebiano and J. da Provid\^encia), Linear and Multilinear Algebra 29 (1991), 195-205. [MR 92i:15016]
{49.} A special linear operator on $M_4(\IR)$ (with S. Chang*), Linear and Multilinear Algebra 30 (1991), 65-75. [MR 92k:15010]
{50.} Isometries of symmetric gauge functions (with \dzd \ and L. Rodman), Linear and Multilinear Algebra 30 (1991), 81-92. [MR 92d:20063]
{51.} Some inequalities on the decomposable numerical radii of matrices, SIAM J. of Matrix Analysis and Appl. 12 (1991), 790-801. [MR 92m:15019]
{52.} On the minimum number of interrupts in time slot assignment for time-division multiple-access systems (with H. Schneider), IEEE Transactions on Communications 39 (1991), 1729-1732.
{53.} Linear operators preserving certain equivalence relations originating in system theory (with L. Rodman and N.K. Tsing), Linear Algebra and Appl. 161 (1992), 165-226. [MR 92k:93046]
{54.} Linear preserver problems : A brief introduction and some special techniques (with N.K. Tsing), Linear Algebra and Appl. 162-164 (1992), 217-236.[MR 93b:15003] pdf file.
{55.} Certain isometries on $\IR^n$ (with S. Chang*), Linear Algebra and Appl. 165 (1992), 251-261. [MR 92k:15059]
{56.} Norms induced by symmetric gauge functions (with R. Hemasinha and J.R. Weaver), Linear and Multilinear Algebra 31 (1992), 217-224. [MR 93k:15042]
{57.} A brief survey on decomposable numerical range of matrices, (with N. Bebiano and J. da Provid\^encia), Linear and Multilinear Algebra 32 (1992), 179-190. [MR 94g:15019]
{58.} Linear maps preserving regional eigenvalue location (with C.R. Johnson, S. Pierce, L. Rodman, I. Spitkovsky), Linear and Multilinear Algebra 32 (1992), 253-264. [MR 94i:15008]
{59.} Linear operators preserving $t$-congruence, (with Y.P. Hong and R. Horn), Linear Algebra and Appl. 175 (1992), 191-211. [MR 93h:15004]
{60.} Product of diagonal elements of matrices, (with N. Bebiano and J. da Provid\^encia), Linear Algebra and Appl. 178 (1993), 185-200. [MR 94a:15041]
{61.} Linear operators leaving a class of matrices with fixed singular values invariant (with N.K. Tsing), Linear and Multilinear Algebra 34 (1993), 41-49. [MR 96c:15013]
{62.} Linear operators preserving unitary $t$-congruence (orthogonal similarity) on complex (real) matrices (with D. Merino**), Linear and Multilinear Algebra 35 (1993), 83-106. [MR 95m:15003]
{63.} Some results on the numerical range of a derivation, (with N. Bebiano and J. da Provid\^encia), SIAM J. of Matrix Analysis and Appl. 14 (1993), 1084-1095.[MR 94i:15022]
{64.} Linear operators preserving certain singular matrix sets (with S. Pierce), Linear and Multilinear Algebra 36 (1993), 19-26. [MR 96b:15005]
{65.} Linear operators preserving the inner and outer $c-$spectral radii (with P. Mehta* and L. Rodman), Linear and Multilinear Algebra 36 (1994), 195-204. [MR 96b:15055]
{66.} Overgroups of some classical linear groups with applications to linear preserver problems (with D.Z. Dokovic), Linear Algebra Appl. 197-198 (1994), 31-62. [MR 95i:20069]
{67.} Anti-diagonals of matrices in a unitary similarity orbit (with M.E. Miranda), Linear Algebra Appl. 197-198 (1994), 317-336. [MR 95c:15056]
{68} A class of linear preserver problems and some useful approaches, Linear Algebra Appl. 197-198 (1994), 817-824.
{69.} Linear operators preserving the $(p,q)$ numerical radius, Linear Algebra Appl. 201 (1994), 21-42. [MR 95a:15023]
{70.} Spectral bounds derived from quadratic forms on decomposable tensors (with R. Grone, S. Pierce and J. Ross), Linear Algebra Appl. 201 (1994), 181-198.[MR 95b:15018]
{71.} Linear operators preserving complex orthogonal equivalence (with D. Merino** and R. Horn), SIAM J. of Matrix Analysis and Appl. 15 (1994), 519-529.[MR 95b:15003]
{72.} A generalized numerical range: The range of a constrained sesquilinear form (with P. Mehta* and L. Rodman), Linear and Multilinear Algebra 37 (1994), 25-50. [MR 96c:15041]
{73.} $C$-numerical ranges and $C$-numerical radii, Linear and Multilinear Algebra 37 (1994), 51-82. [MR 95k:15039]
{74.} Some geometrical properties of the decomposable numerical range (with C.M. Cheng), Linear and Multilinear Algebra 37 (1994), 207-212. [MR 96a:15028b]
{75.} Isometries of $\ell_p$-norm (with W. So), AM Monthly 101 (1994), 452-453. [MR 1 272 946]
{76.} A note on extreme correlation matrices (with B.S. Tam), SIAM J. of Matrix Analysis and Appl. 15 (1994), 903-908. [MR 95c:15044] pdf file.
{77.} Linear operators preserving a similarity class and related results (with S. Pierce), Canadian Math. Bull. 37 (1994), 374-383. [MR 95j:15024]
{78.} Numerical range of matrix polynomials, (with L. Rodman), SIAM J. of Matrix Analysis Appl.\ 15 (1994), 1256-1265. [MR 95f:15021]
{79.} Some aspects of the theory of norms, Linear Algebra Appl. 212 (1994), 71-100. [MR 95h:15043]
{80.} Permutation invariant norms (with P.P. Mehta*), Linear Algebra Appl. 219 (1995), 93-110. [MR 96d:15039]
{81.} Some results on the $c$-numerical ranges (with Y.T. Poon), 247-258, in ``\it Five Decades as a Mathematician and Educator - On the 80th Birthday of Professor Yung Chow Wong\rm'' (editors: K.Y. Chan and M.C. Liu), World Scientific Co., 1995. [MR 97i:47008]
{82.} Linear maps relating different unitary similarity orbits or different generalized numerical ranges (with N.K. Tsing), Linear Algebra Appl. 223-224 (1995), 463-482. [MR 96g:15030]
{83.} Isometries for the vector $(p,q)$ norm and the induced $(p,q)$ norm (with A.-L. S. Klaus*), Linear and Multilinear Algebra 38 (1995), 315-332. [MR 96h:15029]
{84.} A dilation and norm in several variable operator theory (with D.R. Farenick and P. Binding), Canad. J. Math. 47 (1995), 449-461. [MR 96e:47006]
{85.} Minimum Positive Determinant of Integer Matrices with Constant Row and Column Sums (with D.P. Stanford, D.D. Olesky, P. van den Driessche), Linear and Multilinear Algebra 40(1995), 163-170. [MR 98a:15036] pdf file.
{86.} The determinant of the sum of two matrices (with R. Mathias), Bulletin of Australian Math. Soc. 52 (1995), no. 3, 425--429. [MR 96h:15007] pdf file.
{87.} Some convexity theorems for the generalized numerical ranges, Linear and Multilinear Algebra 40 (1996), 235-240. [MR 96k:15014]
{88.} Symmetric overgroups of $S_n$ in $O_n$ (with W. Whitney*), Canad. Math. Bulletin 39 (1996), 83-94. [MR 97g:20057]
{89.} Numerical range of an operator on an indefinite inner product space (with N.K. Tsing and F. Uhlig), Electronic Linear Algebra 1 (1996), 1-17.[MR 97g:47005]
{90.} Distance between the graphs of matrices (with R.A. Horn and D.I. Merino), Linear Algebra Appl. 240 (1996), 65-77. [MR 97e:15004]
{91.} A simple proof of the elliptical range theorem, Proc. of Amer. Math. Soc. 124 (1996), 1985-1986. [MR 96i:15026]
{92.} A research problem: A generalized numerical radius (with H. Woerdeman), Linear and Multilinear Algebra 41 (1996), 41-47. [MR 97e:15023]
{93.} Possible order of the sum of two elements in an additive group, Int. J. Math. Sci. Technol. 27 (1996), 937-938.
{94.} Matrix inequalities involving a positive linear map (with R. Mathias), Linear and Multilinear Algebra 41 (1996), 221-231. [MR 97k:15042]
{95.} Extreme vectors of doubly nonnegative matrices (with C. Hamilton-Jester*), Rocky Mountain J. of Math. 26 (1996), 1371-1383. [MR 98h:15040]
{96.} Determinant of the sum of a symmetric and a skew-symmetric matrix (with N. Bebiano and J. da Providencia), SIAM J. of Matrix Analysis Appl. 18 (1997), 74-82. [MR 98c:15023]
{97.} Partial isometries that arise in X-ray crystallography (with R. Mathias), Linear Algebra Appl. 254 (1997), 303-314. [MR 98a:15037]
{98.} Special classes of positive and completely positive maps (with H. Woerdeman), Linear Algebra Appl. 255 (1997), 247-258. [MR 98b:15001]
{99.} Norm hull of a vector (with N.K. Tsing and F. Zhang), Linear Algebra Appl. 257 (1997), 1-28. [MR 98d:15025]
{100.} Norms and inequalities related to Schur products of rectangular matrices (with W. Huang** and H. Schneider), SIAM J. Matrix Anal. Appl. 18 (1997), no. 2, 334--347. [MR 98c:15076]
{101.} A unified elementary approach to matrix canonical form theorem (with J. Karro*), SIAM Review 39 (1997), 305-309. [MR 1 453 323] pdf file.
{102.} Equality of higher numerical ranges of matrices and a conjecture of Kippenhahn on hermitian pencils (with I. Spitkovsky and S. Shukla*), Linear Algebra Appl. 270 (1997), 323-349. [MR 98k:15040]
{103.} Isometries for the induced $c$-norm on square matrices and some related results (with T. Coleman*, M. Lundquist and T. Travison*), Linear Algebra Appl. 271 (1997), 235-256. [MR 98m:15047]
{104.} Generalized eigenvalues of a definite hermitian matrix pair (with R. Mathias), Linear Algebra Appl. 271 (1997), 309-321. [MR 98j:15013]
{105.} Invertible preservers and algebraic groups III: Preservers of unitary similarity (congruence) invariants and overgroups of some unitary subgroups (with R. Guralnick), Linear and Multilinear Algebra 43 (1997), 257-282.
{106.} $q$-numerical ranges of normal and convex matrices, Linear and Multilinear Algebra 43 (1998), 377-384. [MR 98m:15048]
{107.} Some results on the $q$-numerical ranges (with H. Nakazato), Linear and Multilinear Algebra 43 (1998), 385-410. [MR 98m:15049]
{108.} Generalizations of Ky Fan's Dominance Theorem (with R. Mathias), SIAM J. Matrix Analysis Appl. 19 (1998), 99-106. [MR 99K46015]
{109.} Remarks on numerical ranges of operators in spaces with an indefinite metric (with L. Rodman), Proc. of Amer. Math. Soc. 126 (1998), pp. 973-982. [MR 98f:47005]
{110.} Estimating the Extreme Singular Values of Matrices, (with C. Pohanka*), Mathematical Inequalities and Applications 1 (1998), 153-169.[MR 98m:15017]
{111.} Shapes and Computer Generation of Numerical Ranges of Krein Space Operators (with L. Rodman), Electronic Linear Algebra 3 (1998), 31-47. [MR 99c:15048]
{112.} Isometries of Direct Sums of Sequence Spaces (with B. Randrianantoanina), Asian J. of Mathematics 1 (1998), 157-180.
{113.} Perfect Codes on the Towers of Hanoi Graph (with I. Nelson*), Bulletin of the Australian Math. Soc. 57 (1998), no. 3, 367--376. [MR 99f:94018]
{114.} Some interlacing theorems on the Schur complement (with R. Mathias), Linear and Multilinear Algebra 44 (1998), 373-382. [MR 99f:15026]
{115.} Isometric isomorphisms between normed spaces (with W. So), Rocky Mountain J. of Math. 28 (1998), 607-624. [MR 99k:46015]
{116.} The Lidskii-Mirsky-Wielandt Theorem: Additive and multiplicative versions (with R. Mathias), Numerische Mathematik 81 (1999), no. 3, 377--413. [MR 2000a:65046] pdf file.
{117.} Inequalities on the singular values of an off-diagonal block of a Hermitian matrix (with R. Mathias), J. of Inequalities and Applications 3 (1999), 137-142.
{118.} A note on convex stochastic dominance (with W.K. Wong), Economics Letters 62 (1999), 293-300. [MR 2000e:91087]
{119.} On groups that are isomorphic to a proper subgroup (with S. Fallat**, D. Lutzer and D. Stanford), Mathematics Magazine 72 (1999), 388-391.
{120.} A note on stochastic dominance for risk adverters and risk takers (with W.K. Wong), RAIRO Recherche Operationnelle, 33 (1999), 509-524. pdf file.
{121.} Determinants of Certain Classes of Zero-One Matrices with Equal Line Sums (with J.Lin* and L. Rodman), Rocky Mountain J. of Math. 29 (1999), 1363-1385. pdf file.
{122.} Convexity of the joint numerical range, (with Y.T. Poon), SIAM J. Matrix Analysis Appl. 21 (1999), 668-678. pdf file.
{123.} Some matrix techniques in game theory (with S. Nataraj*), Mathematical Inequalities and Applications 3 (2000), 133-141. pdf file.
{124.} On the Hu-Hurley-Tam Conjecture Concerning The Generalized Numerical Range (with Che-Man Cheng), Linear Algebra Appl. 305 (2000), 87-98. pdf file.
{125.} Numerical ranges and dilations, (with M.D. Choi), Linear and Multilinear Algebra 47 (2000), 35-48. pdf file.
{126.} Numerical ranges arising from simple Lie algebras (with T.Y. Tam), Canad. J. Math. 52 (2000), 141-171. pdf file.
{127.} Nonconvexity of the generalized numerical range associated with the principal character, (with A. Zaharia), Canad. Math. Bulletin 43 (2000), 448-458. pdf file.
{128.} Norms, Isometries, and Isometry Groups, Amer. Math. Monthly, Vol. 107, no. 4 (2000). pdf file.
{129.} Extremal characterizations of the Schur complement and resulting inequalities (with R. Mathias), SIAM Review 42 (2000), 233-246. pdf file.
{130.} Decomposable Numerical Ranges on Orthonormal Tensors (with A. Zaharia), Linear Algebra Appl. 308 (2000), 139-152. pdf file.
{131.} Generalized numerical ranges of permanental compounds arising from quantum systems of bosons (with N. Bebiano and J. da Providencia), Electronic Linear Algebra 7 (2000), 73-91.
{132.} Some General Techniques on Linear Preserver Problems (with A. Guterman** and P. Semrl), Linear Algebra Appl. 315 (2000), 61--81. pdf file.
{133.} A simple proof of the Craig-Sakamoto theorem, Linear Algebra Appl. 321 (2000), 281-283. pdf file.
{134.} Optimizing quadratic forms of adjacency matrices of trees and related eigenvalue problems (with W.S. Cheung**, D. Olesky, Pauline van den Driessche), Linear Algebra and Its Applications, 325 (2001), 191-208. pdf file.
{135.} Linear operators preserving directional majorization (with Edward Poon**), Linear Algebra Appl. 325 (2001), 141-146. pdf file.
{136.} Minimal distortion problems for classes of unitary matrices (with V. Bolotnikov and L. Rodman), Electronic Linear Algebra 8 (2001), 26-46. pdf file.
{137.} Spectral inequalities and equalities involving products of matrices (with Y.T. Poon), Linear Algebra Appl. 323 (2001), 131--143. pdf file.
{138.} A Class of Unitarily Invariant Norms on $B(H)$ (with J.T. Chan and N.C. Tu**), Proc. Amer. Math. Soc. 129 (2001), 1065-1076. pdf file.
{139.} Construction of matrices with prescribed singular values and eigenvalues (with R. Mathias), BIT 41 (2001), 115-126. pdf file.
{140.} Linear Operators Preserving the Numerical Range (Radius) on Triangular Matrices (with Peter Semrl and Graca Soares**), Linear and Multilinear Algebra 48 (2001), 281-292. pdf file.
{141.} Linear Operators Preserving Generalized Numerical Ranges and Radii on Certain Triangular Algebras of Matrices (with W.S. Cheung**), Bulletin Canad. Math. Soc. 44 (2001), 270-281. pdf file.
{142.} Linear Operators Preserving Decomposable Numerical Radii on Orthonormal Tensors (with A. Zaharia), Linear and Multilinear Algebra 49 (2001), 25-43. pdf file.
{143.} A survey on Linear Preservers of Numerical Ranges and Radii, Taiwanese J. Math. 5 (2001), no. 3, 477--496. pdf file.
{144.} Linear preserver problems (with S. Pierce), Amer. Math. Monthly 108 (2001), 591-605. pdf file.
{145.} Constrained Unitary Dilations and Numerical Ranges (with M.D. Choi), J. Operator Theory, 46 (2001), 435--447 pdf file.
{146.} Linear maps leaving the alternating group invariant (with H. Chiang*), Linear Algebra Appl. 340 (2002), 69-80. pdf file.
{147.} Linear maps preserving permutation and stochastic matrices (with B.S. Tam and N.K. Tsing), Linear Algebra Appl. 341 (2002), 5-22. pdf file.
{148.} Interlacing Inequalities for Totally Nonnegative Matrices (with R. Mathias), Linear Algebra Appl., 341 (2002), 35-44. pdf file.
{149.} Inequalities and Equalities for the Cartesian Decomposition (with C.M. Cheng and R. Horn), Linear Algebra Appl. 341 (2002) 219-237. pdf file.
{150.} Induced operators on symmetry classes of tensors (with A. Zaharia), Trans. Amer. Math. Soc., 354 (2002), no. 2, 807--836. pdf file.
{151.} Shells of matrices in indefinite inner product spaces (with V. Bolotnikov, P. Meade*, C. Mehl, and L. Rodman), Electronic Linear Algebra 9 (2002), 67-92.
{152.} The numerical range of a nonnegative matrix (with Bit-Shun Tam and Pei-Yuan Wu), Linear Algebra Appl. 350 (2002), 1-23. pdf file.
{153.} Applications of Perron-Frobenius Theory to Population Dynamics (with Hans Schneider), J. of Math. Biology Volume 44 Issue 5 (2002), 450-462. pdf file.
{154.} Orthogonality of Matrices (with Hans Schneider), Linear Algebra Appl. 347 (2002), 115-122. pdf file.
{155.} Diagonals and partial diagonals of sum of matrices (with Y.T. Poon), Canad. J. Math. 54 (2002), 571-594. pdf file.
{156.} $H$-Joint Numerical Ranges (with Leiba Rodman), Bulletin of Australian Math. Soc. 66 (2002), 105-117. pdf file.
{157.} Multiplicative Preservers on Semigroups of Matrices (with Wai-Shun Cheung and Shaun Fallat), Linear Algebra Appl. 355 (2002), 173-186. pdf file.
{158.} Inequalities on singular values of block triangular matrices (with Roy Mathias), SIAM Matrix Analysis Appl. 24 (2002), 126--131. pdf file.
{159.} Numerical radius isometries (with Peter Semrl), Linear and Multilinear Algebra 50 (2002), 307-314 pdf file.
{160.} Additive Decomposition of Real Matrices (with Ed. Poon), Linear and Multilinear Algebra 50 (2002), 321-326. pdf file.
{161.} Linear Transformations Between Matrix Spaces that Map One Rank Specific Set into Another (with Leiba Rodman Peter Semrl), Linear Algebra Appl. 357 (2002), 197-208. pdf file.
{162.} Linear operators preserving correlation matrices, (with S. Pierce), Proc. Amer. Math. Soc. 131 (2003), no. 1, 55--63. pdf file.
{163.} Linear Preservers of Finite Reflection Groups (with Tom Milligan**), Linear and Multilinear Algebra 51 (2003), 49-82. pdf file.
{164.} Linear maps transforming the unitary group (with W.S. Cheung), Canad. Math. Bulletin 46 (2003), 54-58. pdf file.
{165.} Some Convexity Features Associated with Unitary Orbits (with M.D. Choi and Y.T. Poon), Canad. J. Math. 55 (2003), 91-111. pdf file.
{166.} Principal Submatrices of a Hermitian matrix (with Yiu-Tung Poon), Linear and Multilinear Algebra 51 (2003), 199-208. pdf file.
{167.} On numerical ranges and roots (with Leiba Rodman and Ilya Spitkovsky), J. Math. Anal. Appl. (2003), 329-340. pdf file.
{168.} Norm Bounds on the Sum of Block Diagonal Matrices (with R. Mathias), Mathematical Inequalities and Applications 6 (2003), 215-222. pdf file.
{169.} Linear Maps on Selfadjoint Operators Preserving Invertibility, Positive Definiteness, Numerical Range (with L. Rodman and P. Semrl), Canad. Math. Bull., 46 (2003), 216-228. pdf file.
{170.} Linear Maps Leaving Invariant Subsets of Nonnegative Symmetric Matrices (with Hanley Chiang*), Bulletin of Australian Math. Soc., 68 (2003), 221-231. pdf file.
{171.} Multiplicative Preserver Maps of Invertible Matrices (with R. Guralnick and L. Rodman), Electronic Linear Algebra 10 (2003), 291-319. pdf file.
{172.} Isometries for Ky-Fan norms on block triangular matrix algebras (with Peter Semrl and Ahmed Sourour), Arch. Math. (Basel) 81 (2003), no. 2, 175--181. pdf file.
{173.} Norm Bounds for Summation of Two Normal Matrices (with Man-Duen Choi), Linear Algebra Applications 379 (2004), 137-158. pdf file.
{174.} Central Groupoids, Central Digraphs, and Zero-One Matrices $A$ Satisfying $A^2 = J$ (with Frank Curtis*, John Drew, and Daniel Pragel*), J. Combinatorial Theory, Series A, 105 (2004), 35-50. pdf file.
{175.} Linear Operators on Matrix Algebras that Preserve the Numerical Range, Numerical Radius or the States (with Ahmed Sourour), Canad. J. Math. 56 (2004), no. 1, 134--167. pdf file.
{176.} Linear operators transforming $H$-unitary matrices (with Nung-Sing Sze**), Linear Algebra Appl. 377 (2004), 111--124. pdf file.
{177.} Inclusion regions for numerical ranges and linear preservers (with Nung-Sing Sze**), Linear and Multilinear Algebra 52 (2004), 235-249. pdf file.
{178.} Multiplicative Preservers of $C$-Numerical Ranges and Radii (with Leiba Rodman), Linear and Multilinear Algebra 52 (2004), 265-279. pdf file.
{179.} Finite reflection groups and linear preserver problems (with I. Spitkovsky and N. Zobin), Rocky Mountain J. of Mathematics 34 (2004), 225-252. pdf file.
{180.} Induced Norms, States, and Numerical Ranges (with Edward Poon and Hans Schneider), Proc. Amer. Math. Soc. 132 (2004), 1501-1506. pdf file.
{181.} Geometric means (with T. Ando and R. Mathias), Linear Algebra Appl. 385 (2004), 305-344. pdf file.
{182.} Off-diagonal Submatrices of a Hermitian Matrix (with Yiu-Tung Poon), Proc. Amer. Math. Soc. 132 (2004), no. 10, 2849--2856. pdf file.
{183.} Isometries Between Matrix Algebras (with Wai-Shun Cheung and Yiu-Tung Poon), J. Aust. Math. Soc. 77 (2004), 1-16. pdf file.
{184.} $H$-unitary and Lorentz matrices: A review (with Yik-Hoi Au-Yeung and Leiba Rodman), SIAM J. Matrix Analysis Appl., 26 (2004), 1140-1162. pdf file.
{185.} Uniqueness of the solutions of some completion problems (with Tom Milligan**), Linear Algebra Appl. 392 (2004), 91-102. pdf file.
{186.} Non-existence of 5X5 full ray nonsingular matrices, (with T. Milligan** and B. Shader), Electronic Linear Algebra 11 (2004), 212-240.
{187.} The arithmetic of algebraic numbers: an elementary approach (with David Lutzer), College Math. J. - Classroom Capsules 35 (2004), 307-309. pdf file.
{188.} Isometries for Ky Fan Norms Between Matrix Spaces (with Yiu-Tung Poon and Nung-Sing Sze**), Proc. Amer. Math. Soc. 133 (2005), no. 2, 369-377. pdf file.
{189.} Eigenvalues, singular values, and Littlewood-Richardson Coefficients (with S. Fomin, W. Fulton, and Y.T. Poon), Amer. J. Math. 127 (2005), 101-127. pdf file.
{190.} A Note on Eigenvalues of Perturbed {H}ermitian Matrices (with Ren-Cang Li), Linear Algebra Appl. 395 (2005), 183-190. pdf file.
{191.} Generalized Doubly Stochastic Matrices and Linear Preservers, (with H. Chiang*), Linear and Multilinear Algebra 53 (2005), 1-11. pdf file.
{192.} A Partition Problem for Sets of Permutation Matrices (with R. Brualdi and H. Chiang*), Bulletin of ICA 43 (2005), 67-79. pdf file.
{193.} Isometries for unitarily invariant norms (with Jor-Ting Chan and Nung-Sing Sze**), Linear Algebra Appl. 399 (2005), 53-70. pdf file.
{194.} Inverse closed ray-nonsingular cones of matrices {with Leiba Rodman}, Linear Algebra Appl. 400 (2005), 203-230. pdf file.
{195.} Linear maps transforming the higher numerical ranges (with Yiu-Tung Poon and Nung-Sing Sze**), Linear Algebra Appl. 400 (2005), 291-312. pdf file.
{196.} Operator properties of $T$ and $K(T)$, (with Tin-Yau Tam), Linear Algebra Appl. 401 (2005), 173-192. pdf file.
{197.} Multiplicative Preservers and Induced Operators (with Wai-Shun Cheung and Maria Antonia Duffner), Linear Algebra Appl. 401 (2005), 307-324. pdf file.
{198.} Unitarily Invariant Metrics on the Grassmann Space (with Li Qiu and Yanxia Zhang), SIAM J. Matrix Anal. Appl. 27 (2005), 507-531. pdf file.
{199.} Automorphisms of Certain Groups and Semigroups of Matrices (with Michael Alwill*, Christine Maher*, and Nung-Sing Sze**), Linear Algebra Appl. 412 (2006), 490-525. pdf file.
{200.} The Ultimate Estimate of the Upper Norm Bound for the Summation of Operators (with Man-Duen Choi), Journal of Functional Analysis 232 (2006), 455-476. pdf file.
{201.} A lower bound on the C-numerical radius of nilpotent matrices appearing in coherent spectroscopy (with Hugo Woerdeman), SIAM J. Matrix Anal. Appl. 27 (2006), 793-900. pdf file.
{202.} A short proof of interlacing inequalities on normalized Laplacians, Linear Algebra Appl., 414 (2006), 425-427. pdf file.
{203.} Optimal Parameter in Hermitian and Skew-Hermitian Splitting Method for Certain Two-by-Two Block Matrices (with Zhong-Zhi Bai and Gene Golub), SIAM J. Sci. Comp. 28 (2006), 583-603. pdf file.
{204.} Distances from a Hermitian pair to diagonalizable and non-diagonalizable Hermitian pairs (with Roy Mathias), SIAM J. Matrix Anal. Appl, 28 (2006), 301-305. pdf file.
{205.} Product of operators and numerical range preserving maps, (with Nung-Sing Sze**), Studia Math. 174 (2006), no. 2, 169--182. pdf file.
{206.} On the evolution of dispersal in patch environments (with Sebastian Schreiber and Steve Kirkland), SIAM J. Appl. Math. 66 (2006), 1366--1382. pdf file.
{207.} Mappings on matrices: Invariance of functional values of matrix products (with Jor-Ting Chan and Nung-Sing Sze**), J. Aust. Math. Soc. 81 (2006), 165-184. pdf file.
{208.} On dispersal and population growth for multistate matrix models (with Sebastian Schreiber), Linear Algebra Appl. 418 (2006), 900-912. pdf file.
{209.} Extension of the Total Least Square Problem Using General Unitarily Invariant Norms (with Xin-Guo Liu and Xue-Feng Wang), Linear and Multilinear Algebra 55(2007), 71-79. pdf file.
{210.} Mappings preserving spectra of products of matrices (with Jor-Ting Chan and Nung-Sing Sze**), Proc. Amer. Math. Soc., 135 (2007), 977-986. pdf file.
{211.} Convergence Properties of Preconditioned Hermitian and Skew-Hermitian Splitting Methods for Non-Hermitian Positive Semidefinite Matrices (with Z.Z. Bai and G. Golub), Math. Comput. 257 (2007), 287-298. pdf file.
{212.} $G$-invariant norms and bicircular projections (with Maja Fosner, Dijana Ilisevic), Linear Algebar Appl. 420 (2007), 596--608. pdf file.
{213.} Schur product of matrices and numerical radius (range) preserving maps (with Edward Poon), Linear Algebra Appl.424 (2007), 8-24. pdf file.
{214.} Maps preserving the nilpotency of products of operators (with Peter \v Semrl and Nung-Sing Sze), Linear Algebra Appl. 424 (2007), 222-239. pdf file.
{215.} Operators with numerical range in a closed halfplane (with Wai-Shun Cheung and Leiba Rodman), Taiwanese J. Mathematics 11 (2007), 471-481. pdf file.
{216.} Eigenvalues of An Alignment Matrix in Nonlinear Manifold Learning (with Ren-Cang Li and Qiang Ye), Communications in Mathematical Sciences 5 (2007), 313-329. pdf file.
{217.} Mappings that preserve pairs of operators with zero triple Jordan product (with M. Dobovi\v{s}ek, {B. Kuzma, G. Le\v{s}njak, T. Petek), Linear Algebra Appl. 426 (2007), 255-279. pdf file.
{218.} Numerical Ranges of the Derivation of Induced Operators (with Randall R. Holmes and Tin-Yau Tam), J. Aust. Math. Soc. 82 (2007), 325-343. pdf file.
{219.} $C^*$-Isomorphisms, Jordan Isomorphisms, and Numerical Range Preserving Maps (with Hwa-Long Gau), Proc. Amer. Math. Soc., 135 (2007), 2907-2914. pdf file.
{220.} Maps preserving spectral radius, numerical radius, spectral norm (with Edward Poon and Ashwin Rastogi*), Electronic Linear Algebra 16 (2007), 347-359.
{221.} Polynomial numerical hulls of matrices (with Chandler Davis and Abbas Salemi), Linear Algebra Appl. 428 (2008), 137-153. pdf file.
{222.} Jordan isomorphisms and maps preserving spectra of certain operator products (with J.C. Hou and N.C. Wong), Studia Math. 184 (2008), 31-47. pdf file.
{223.} Ranks and determinants of the sum of matrices from unitary orbits (with Yiu-Tung Poon and Nung-Sing Sze), Linear and Multilinear Algebra 56 (2008), 105-130. pdf file.
{224.} Schur multiplicative maps on matrices (with S. Clark* and A. Rastogi*), Bulletin of Aust. Math. Soc. 77 (2008), 49-72. pdf file.
{225.} Canonical forms, higher rank numerical ranges, totally isotropic subspaces, and matrix equations (with Nung-Sing Sze), Proc. Amer. Math. Soc. 136 (2008), 3013-3023. e-preprint.
{226.} Higher rank numerical ranges and low rank perturbations of quantum channels (with Yiu-Tung Poon and Nung-Sing Sze), J. Mathematical Analysis Appl. 348 (2008), 843-855. pdf file.
{227.} Eigenvalues of the sum of matrices from unitary similarity orbits (with Yiu-Tung Poon and Nung-Sing Sze), SIAM J. Matrix Analysis Appl. 30 (2008) 560-581. pdf file.
{228.} Higher-Rank Numerical Ranges and Dilations (with H.L. Gau and P.Y. Wu), J. Operator Theory, 9 pages. pdf file.
{229.} Davis-Wielandt Shells of Operators (with Yiu-Tung Poon and Nung-Sing Sze), Operators and Matrices, 17 pages pdf file.
{230} Davis-Wielandt Shells of Normal Operators (with Yiu-Tung Poon), Acta Sci. Math. (Szeged), 8 pages. pdf file.
{231} Preservers of spectral radius, numerical radius, or spectral norm of the sum on nonnegative matrices (with Leiba Rodman), Linear Algebra Appl., 20 pages. pdf file.
{232.} Graphs equienergetic with edge-deleted subgraphs (with Wasin So), Linear and Multilinear Algebra, 12 pages. pdf file.
{233.} Sum of Hermitian matrices with given eigenvalues: Inertia, rank, and multiple eigenvalues (with Yiu-Tung Poon), Canad. J. Mathematics, 23 pages. pdf file.
{234.} Spectral radius preservers of products of nonnegative matrices (with Sean Clark* and Leiba Rodman), Banach J. Math. Anal., 14 pages. pdf file.
{235.} Spectrum, Numerical Range and Davis-Wielandt Shell of a Normal Operator (with Yiu-Tung Poon), Glasgow Math. J., 13 pages. pdf file.
{236.} Condition for the higher rank numerical range to be non-empty (with Yiu-Tung Poon and Nung-Sing Sze), Linear and Multilinear Algebra, 4 pages. pdf file.
{237.} Elliptical range theorems for generalized numerical ranges of quadratic operators (with Yiu-Tung Poon and Nung-Sing Sze), Rocky Mountain J. Math., 19 pages. pdf file.
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{1.} Proceedings of the Second Conference of the International Linear Algebra Society, Lisbon, August 3--7, 1992. Linear Algebra Appl. 197/198 (1994). (Special Editors: J. Dias da Silva, C.K. Li and G. de Oliveira)
{2.} Special issue on The Numerical Range and Numerical Radius, Linear and Multilinear Algebra Vol.\ 37, nos 1--3, 1994. (Special Editors: T. Ando and C.K. Li)
{3.} Special issue on The Numerical Range and Numerical Radius, Linear and Multilinear Algebra Vol.\ 43, no 4, 1998. (Special Editors: T. Ando and C.K. Li)
{4.} Special issue dedicated to Professor T. Ando, Linear Algebra Appl. 341 (2002), 1--3. (Special Editors: R. Bhatia, C.K. Li, K. Okubo, M. Tsatsomeros)
{5.} Special issue on The Numerical Range and Numerical Radius, Linear and Multilinear Algebra Vol.\ 52, nos 3--4, 2004. (Special Editors: C.K. Li and T.Y. Tam)
{6.} Proceedings of the International Conference on Matrix Analysis and Applications Dec. 14-16, 2003, Nova Southeastern University, Fort Lauderdale, Florida, Linear Algebra Appl. Vol. 399, 2005. (Special Editors: C.K. Li, H. Woerdeman, F. Zhang)
{7.} Special issue on The Numerical Range and Numerical Radius, Linear and Multilinear Algebra Vol.\ 56, nos 1--2, 2008. (Special Editors: C.K. Li, L. Rodman and C. Tretter)
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