%0 Journal Article
%A A. Menikoff
%T Some Examples of Hypoelliptic Partial Differential Equations.
%J Mathematische Annalen
%D 1976
%P 167-182
%V 221
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1976__221_162841/
%F MAN_1976__221_162841