@article{GDZPPN00206474X, title = {Invariant differential operators in hyperbolic spaces.}, journal = {Commentarii mathematici Helvetici}, volume = {57}, year = {1982}, pages = {412-444}, zbl = {0512.53048}, url = {http://dml.mathdoc.fr/item/GDZPPN00206474X} }
Reimann, H.M. Invariant differential operators in hyperbolic spaces.. Commentarii mathematici Helvetici, Tome 57 (1982) pp. 412-444. http://gdmltest.u-ga.fr/item/GDZPPN00206474X/