%0 Journal Article %A A. Shapiro %T Optimally Scaled Matrices, Necessary and Sufficient Conditions. %J Numerische Mathematik %D 1982 %P 239-246 %V 39 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1982__39_132794/ %F NUMA_1982__39_132794