LINEAR ALGEBRA AND ITS APPLICATIONS Linear Algebra and its Applications 325 (2001) 221 www.elsevier.com/locate/laa Author index to volume 325 (2001) Alfakih, A.Y., On rigidity and realizability of Li, C.-K. and E. Poon, Linear operators pre- weighted graphs 325 (2001) 57 serving directional majorization 325 (2001) 141 Barnabei, M. and L.B. Montefusco, On a Li, C.-K., see Cheung, W.-S. 325 (2001) 191 class of matrices with low displacement rank 325 (2001) 161 Mallik, R.K., The inverse of a tridiagonal ma- Bostian, A.A. and H.J. Woerdeman, Unicity trix 325 (2001) 109 of minimal rank completions for tri-diago- Ming, G.J. and T.S. Wang, A relation be- nal partial block matrices 325 (2001) 23 tween the matching number and Laplacian Brewer, J. and L. Klingler, On feedback invar- spectrum of a graph 325 (2001) 71 iants for linear dynamical systems 325 Montefusco, L.B., see Barnabei, M. 325 (2001) (2001) 209 161 Cheung, W.-S., C.-K. Li, D.D. Olesky and Okubo, K. and I. Spitkovsky, On the charac- P. van den Driessche, Optimizing quadratic terization of 2 x 2 p-contraction matrices forms of adjacency matrices of trees and re- 325 (2001) 177 lated eigenvalue problems 325 (2001) 191 Olesky, D.D., see Cheung, W.-S. 325 (2001) 191 da Fonseca, C.M. and J. Petronilho, Explicit inverses of some tridiagonal matrices 325 (2001) 7 Pascasio, A.A., An inequality on the cosines Dobovisek, M., On minimal solutions of the of a tight distance-regular graph 325 (2001) 147 matrix equation AY — YB = 0 325 (2001) 81 Petronilho, J., see da Fonseca, C.M. 325 (2001) Fitzgerald, R.W., Norms of sums of squares 7 325 (2001) 1 Poon, E., see Li, C.-K. 325 (2001) 141 Ikramov, K.D., Hamiltonian square roots of Spitkovsky, I., see Okubo, K. 325 (2001) 177 skew-Hamiltonian matrices revisited 325 (2001) 101 van den Driessche, P., see Cheung, W.-S. 325 (2001) 191 Klingler, L., see Brewer, J. 325 (2001) 209 Wang, T.S., see Ming, G.J. 325 (2001) 71 LeSnjak, G., A note on constrained conver- Woerdeman, H.J., see Bostian, A.A. 325 gence 325 (2001) 75 (2001) 23 Elsevier Science Inc. PII: S0024-3795 (01) 00227-0