%0 Journal Article
%A Fulvio Ricci
%A Detlef Müller
%T Solvability for a class of non-homogeneous differential operators on two-step nilpotent groups.
%J Mathematische Annalen
%D 1996
%P 517-548
%V 304
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1996__304_4_165414/
%F MAN_1996__304_4_165414