%0 Journal Article
%A Yu. V. Egorov
%T The smoothness of the solutions of equations of principal type
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1977
%V 32
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1977_32_5_a13/
%G ru
%F RM_1977_32_5_a13