%0 Journal Article
%A B. M. Usifov
%A Z. A. Karagezov
%T On the problem of the existence of optimal controls
%J Differencialʹnye uravneniâ
%D 1990
%P 1437-1441
%V 26
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1990_26_8_a20/
%G ru
%F DE_1990_26_8_a20