%0 Journal Article
%A K. B. Mansimov
%T Conditions for second-order optimality in Goursat--Darboux systems in the presence of constraints
%J Differencialʹnye uravneniâ
%D 1990
%P 954-965
%V 26
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1990_26_6_a4/
%G ru
%F DE_1990_26_6_a4