%0 Journal Article
%A C. Robin Graham
%T Compatibility Operators for Degenerate Elliptic Equations on the Ball and Heisenberg Groups.
%J Mathematische Zeitschrift
%D 1984
%P 289-304
%V 187
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1984__187_173491/
%F MZ_1984__187_173491