%0 Journal Article %A A. S. Sokhin %T Some problems of optimal control for a nonlinear control system described by an oscillation equation %J Differencialʹnye uravneniâ %D 1981 %P 501-509 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1981_17_3_a7/ %G ru %F DE_1981_17_3_a7