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@article{MM2_1987__59_155259, author = {Ulrich Christian}, title = {\"Uber gewisse {Poincar\'e'sche} {Reihen} zu elliptischen {Modulgruppen.}}, journal = {Manuscripta mathematica}, pages = {423--440}, publisher = {mathdoc}, volume = {59}, year = {1987}, zbl = {0627.10016}, url = {http://geodesic.mathdoc.fr/item/MM2_1987__59_155259/} }
Ulrich Christian. Über gewisse Poincaré'sche Reihen zu elliptischen Modulgruppen.. Manuscripta mathematica, Tome 59 (1987), pp. 423-440. http://geodesic.mathdoc.fr/item/MM2_1987__59_155259/