%0 Journal Article
%A Michael Langenbruch
%T On the Functional Dimension of Solution Spaces of Hypoelliptic Partial Differential Operators.
%J Mathematische Annalen
%D 1985
%P 217-230
%V 272
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1985__272_164008/
%F MAN_1985__272_164008