%0 Journal Article %A V. G. Boltyanskii %T The problem of optimization with change of phase space %J Differencialʹnye uravneniâ %D 1983 %P 518-521 %V 19 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_3_a16/ %G ru %F DE_1983_19_3_a16