%0 Journal Article
%A Nguen Min' Chi
%T Fourth-order hypoelliptic pseudodifferential operators with a noninvolutive characteristic set
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1990
%P 71-73
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a17/
%G ru
%F VMUMM_1990_2_a17