TY  - JOUR
AU  - Fulvio Ricci
AU  - Detlef Müller
TI  - Solvability for a class of non-homogeneous differential operators on two-step nilpotent groups.
JO  - Mathematische Annalen
PY  - 1996
SP  - 517
EP  - 548
VL  - 304
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1996__304_4_165414/
ID  - MAN_1996__304_4_165414
ER  -