%0 Journal Article %A N. N. Subbotina %T Universal optimal strategies in positional differential games %J Differencialʹnye uravneniâ %D 1983 %P 1890-1896 %V 19 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_11_a8/ %G ru %F DE_1983_19_11_a8