TY  - JOUR
AU  - C. Robin Graham
TI  - Compatibility Operators for Degenerate Elliptic Equations on the Ball and Heisenberg Groups.
JO  - Mathematische Zeitschrift
PY  - 1984
SP  - 289
EP  - 304
VL  - 187
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1984__187_173491/
ID  - MZ_1984__187_173491
ER  -