%0 Journal Article %A Young, N. J. %T Norms of certain rational functions of a matrix and Schur's criterion for polynomials %J Commentationes Mathematicae Universitatis Carolinae %D 1978 %P 673-688 %V 19 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1978__19_4_a4/ %G en %F CMUC_1978__19_4_a4