%0 Journal Article
%A V. S. Fedii
%T An example of a second-order nonhypoelliptic operator with the property of global hypoellipticity
%J Matematičeskie zametki
%D 1972
%P 269-274
%V 12
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1972_12_3_a6/
%G ru
%F MZM_1972_12_3_a6