%0 Journal Article
%A G. I. Èskin
%T A conjugacy problem for equations of principal type with two independent variables
%J Trudy Moskovskogo matematičeskogo obŝestva
%D 1970
%P 245-292
%V 21
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MMO_1970_21_a6/
%G ru
%F MMO_1970_21_a6