%0 Journal Article
%A E. E. Barbashina
%T A Compact Formula for the Third Variation and Necessary Optimality Conditions
%J Differencialʹnye uravneniâ
%D 2002
%P 414-415
%V 38
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_2002_38_3_a18/
%G ru
%F DE_2002_38_3_a18