%0 Journal Article
%A Yu. V. Egorov
%T Conditions for the local solvability of equations of principal type
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1971
%V 26
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1971_26_3_a9/
%G ru
%F RM_1971_26_3_a9