%0 Journal Article
%A S. M. Ponomarev
%T On the theory of boundary value problems for equations of mixed type in three-dimensional domains
%J Doklady Akademii Nauk
%D 1979
%P 1303-1306
%V 246
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1979_246_6_a4/
%G ru
%F DAN_1979_246_6_a4