%0 Journal Article
%A L. Ashchepkov
%T On necessary conditions for high order optimality for singular controls of discrete systems
%J Differencialʹnye uravneniâ
%D 1972
%P 1857-1867
%V 8
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1972_8_10_a15/
%G ru
%F DE_1972_8_10_a15