%0 Journal Article %A R. Gabasov %T The optimality of singular controls %J Differencialʹnye uravneniâ %D 1968 %P 1000-1011 %V 4 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1968_4_6_a4/ %G ru %F DE_1968_4_6_a4