TY - JOUR AU - Young, N. J. TI - Norms of certain rational functions of a matrix and Schur's criterion for polynomials JO - Commentationes Mathematicae Universitatis Carolinae PY - 1978 SP - 673 EP - 688 VL - 19 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1978__19_4_a4/ LA - en ID - CMUC_1978__19_4_a4 ER -