%0 Journal Article
%A I. M. Petrushko
%T Boundary value problems for equations of mixed type
%J Informatics and Automation
%D 1968
%P 181-200
%V 103
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_1968_103_a11/
%G ru
%F TRSPY_1968_103_a11