%0 Journal Article
%A S. M. Ponomarev
%T On the Tricomi problem for a system of equations of mixed type in the plane
%J Doklady Akademii Nauk
%D 1978
%P 1256-1257
%V 242
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1978_242_6_a4/
%G ru
%F DAN_1978_242_6_a4