%0 Journal Article
%A A. V. Bitsadze
%T On the theory of equations of mixed type
%J Differencialʹnye uravneniâ
%D 1970
%P 3-6
%V 6
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_1_a0/
%G ru
%F DE_1970_6_1_a0