%0 Journal Article
%A V. G. Litvinov
%T A modification of the Ritz method for variational equations and its applications to boundary value problems with mixed boundary conditions
%J Differencialʹnye uravneniâ
%D 1981
%P 519-526
%V 17
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1981_17_3_a9/
%G ru
%F DE_1981_17_3_a9