TY  - JOUR
AU  - Michael Langenbruch
TI  - On the Functional Dimension of Solution Spaces of Hypoelliptic Partial Differential Operators.
JO  - Mathematische Annalen
PY  - 1985
SP  - 217
EP  - 230
VL  - 272
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1985__272_164008/
ID  - MAN_1985__272_164008
ER  -