%0 Journal Article
%A G. G. Kazaryan
%A V. N. Markaryan
%T Hypoellipticity criteria in terms of power and strength of operators
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1979
%P 128-142
%V 150
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1979_150_a7/
%G ru
%F TM_1979_150_a7