%0 Journal Article
%A V. N. Vragov
%T On the theory of boundary value problems for equations of mixed type in space
%J Differencialʹnye uravneniâ
%D 1977
%P 1098-1105
%V 13
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_6_a14/
%G ru
%F DE_1977_13_6_a14