%0 Journal Article %A Doležal, Jaroslav %T Existence of optimal solutions in general discrete systems %J Kybernetika %D 1975 %P -312 %V 11 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_1975__11_4_a4/ %G en %F KYB_1975__11_4_a4