%0 Journal Article %A È. R. Smol'yakov %T Necessary and sufficient conditions for the existence of boundaries of the equilibrium set in antagonistic differential games %J Differencialʹnye uravneniâ %D 1997 %P 1639-1650 %V 33 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1997_33_12_a7/ %G ru %F DE_1997_33_12_a7