%0 Journal Article
%A S. L. Krushkal'
%T A new approach to variational problems of the theory of
%J Doklady Akademii Nauk
%D 1987
%P 1297-1300
%V 292
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_292_6_a3/
%G ru
%F DAN_1987_292_6_a3