%0 Journal Article
%A V. N. Vragov
%T Some boundary value problems for a certain class of equations of mixed type in the three-dimensional case
%J Differencialʹnye uravneniâ
%D 1975
%P 27-32
%V 11
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_1_a3/
%G ru
%F DE_1975_11_1_a3