%0 Journal Article
%A E. I. Ganzha
%T Hypoellipticity of a second-order differential operator
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1985
%P 96-99
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1985_6_a17/
%G ru
%F VMUMM_1985_6_a17