%0 Journal Article
%A I. T. Skorodinskii
%T Investigation of the third variation of a functional on singular controls
%J Differencialʹnye uravneniâ
%D 1980
%P 1438-1444
%V 16
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_8_a9/
%G ru
%F DE_1980_16_8_a9