%0 Journal Article
%A N. A. Shananin
%T On necessary conditions for the local solvability of equations of quasiprincipal type
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1977
%V 32
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1977_32_2_a21/
%G ru
%F RM_1977_32_2_a21