%0 Journal Article
%A M. E. Lerner
%T Maximum principles for second order equations of mixed elliptic-hyperbolic type
%J Doklady Akademii Nauk
%D 1969
%P 991-994
%V 185
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_185_5_a5/
%G ru
%F DAN_1969_185_5_a5