%0 Journal Article
%A Nguyẽn Minh Trí
%T On the global hypoellipticity property of a higher-order differential operator
%J Differencialʹnye uravneniâ
%D 1990
%P 687-692
%V 26
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1990_26_4_a16/
%G ru
%F DE_1990_26_4_a16