%0 Journal Article
%A Yu. P. Krivenkov
%T Necessary optimality conditions for a linear problem with second order differential equations of elliptic type in the presence of phase constraints
%J Doklady Akademii Nauk
%D 1977
%P 28-31
%V 232
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_232_1_a5/
%G ru
%F DAN_1977_232_1_a5