%0 Journal Article
%A Yu. V. Egorov
%T On solvability conditions for differential equations with simple characteristics
%J Doklady Akademii Nauk
%D 1976
%P 1310-1312
%V 229
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_229_6_a6/
%G ru
%F DAN_1976_229_6_a6