%0 Journal Article
%A V. P. Didenko
%T A variational problem for equations of mixed type
%J Differencialʹnye uravneniâ
%D 1977
%P 44-49
%V 13
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_1_a6/
%G ru
%F DE_1977_13_1_a6