%0 Journal Article
%A T. I. Lanina
%T Certain problems for equations of hyperbolic and mixed types
%J Differencialʹnye uravneniâ
%D 1973
%P 115-122
%V 9
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_1_a11/
%G ru
%F DE_1973_9_1_a11