%0 Journal Article
%A E. E. Barbashina
%T Necessary optimality conditions for systems of differential equations that are not solved with respect to the derivative
%J Differencialʹnye uravneniâ
%D 1981
%P 1478-1480
%V 17
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1981_17_8_a11/
%G ru
%F DE_1981_17_8_a11