%0 Journal Article
%A M. I. Sumin
%T On the first variation in the theory of optimal control of systems with distributed parameters
%J Differencialʹnye uravneniâ
%D 1991
%P 2179-2181
%V 27
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_12_a26/
%G ru
%F DE_1991_27_12_a26