%0 Journal Article %A Zhang, Xiao-Dong %A Ding, Chang-Xing %T The equality cases for the inequalities of Oppenheim and Schur for positive semi-definite matrices %J Czechoslovak Mathematical Journal %D 2009 %P 197-206 %V 59 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2009__59_1_a13/ %G en %F CMJ_2009__59_1_a13