%0 Journal Article %A Yu. S. Ledyaev %A E. F. Mishchenko %T Conditions for the optimality of strategies in differential games of fixed duration %J Differencialʹnye uravneniâ %D 1987 %P 244-255 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_2_a7/ %G ru %F DE_1987_23_2_a7