%0 Journal Article
%A F. P. Vasil'ev
%T Optimality conditions for certain classes of systems which are not solved with respect to the derivative
%J Doklady Akademii Nauk
%D 1969
%P 1267-1270
%V 184
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_184_6_a1/
%G ru
%F DAN_1969_184_6_a1