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@article{IM_1985__80_143234, author = {P. Sarnak and R.S. Phillips}, title = {On cusp forms for co-finite subgroups of {PSL(2,} {IR).}}, journal = {Inventiones mathematicae}, pages = {339--364}, publisher = {mathdoc}, volume = {80}, year = {1985}, zbl = {0558.10017}, url = {http://geodesic.mathdoc.fr/item/IM_1985__80_143234/} }
P. Sarnak; R.S. Phillips. On cusp forms for co-finite subgroups of PSL(2, IR).. Inventiones mathematicae, Tome 80 (1985), pp. 339-364. http://geodesic.mathdoc.fr/item/IM_1985__80_143234/