%0 Journal Article
%A V. I. Arkin
%A V. L. Levin
%T A variational problem with functions of several variables and operator restrictions: The maximum principle and existence theorem
%J Doklady Akademii Nauk
%D 1971
%P 9-12
%V 200
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_200_1_a0/
%G ru
%F DAN_1971_200_1_a0