%0 Journal Article
%A G. D. Dachev
%T On the existence of smooth solutions of boundary value problems for a class of equations of mixed type
%J Differencialʹnye uravneniâ
%D 1991
%P 619-627
%V 27
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_4_a7/
%G ru
%F DE_1991_27_4_a7