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@article{MZ_1984__187_173491, author = {C. Robin Graham}, title = {Compatibility {Operators} for {Degenerate} {Elliptic} {Equations} on the {Ball} and {Heisenberg} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {289--304}, publisher = {mathdoc}, volume = {187}, year = {1984}, zbl = {0538.47031}, url = {http://geodesic.mathdoc.fr/item/MZ_1984__187_173491/} }
C. Robin Graham. Compatibility Operators for Degenerate Elliptic Equations on the Ball and Heisenberg Groups.. Mathematische Zeitschrift, Tome 187 (1984), pp. 289-304. http://geodesic.mathdoc.fr/item/MZ_1984__187_173491/