%0 Journal Article
%A G. G. Kazaryan
%T A~characterization of hypoellipticity by estimates from below
%J Informatics and Automation
%D 1976
%P 162-168
%V 140
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_1976_140_a7/
%G ru
%F TRSPY_1976_140_a7