%0 Journal Article
%A E. R. Avakov
%T First-order necessary conditions for abnormal problems in the calculus of variations
%J Differencialʹnye uravneniâ
%D 1991
%P 739-745
%V 27
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_5_a0/
%G ru
%F DE_1991_27_5_a0