%0 Journal Article %A V. B. Kolmanovskii %T Optimal control of certain nonlinear systems with a small parameter %J Differencialʹnye uravneniâ %D 1975 %P 1584-1594 %V 11 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1975_11_9_a5/ %G ru %F DE_1975_11_9_a5