%0 Journal Article
%A I. V. Maiorov
%T A problem for equations of mixed type with a closed line of degeneracy
%J Differencialʹnye uravneniâ
%D 1978
%P 1321-1323
%V 14
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1978_14_7_a20/
%G ru
%F DE_1978_14_7_a20