%0 Journal Article %A M. Niezgoda %T On Schur-Ostrowski Type Theorems for Group Majorizations %J Journal of convex analysis %D 1998 %P 081-106 %V 5 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/JCA_1998_5_1_a6/ %F JCA_1998_5_1_a6