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@article{JRAM_1988__386_153023, author = {Andrew M. Winkler}, title = {Cusp forms and {Hecke} groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {187--204}, publisher = {mathdoc}, volume = {386}, year = {1988}, zbl = {0647.10019}, url = {http://geodesic.mathdoc.fr/item/JRAM_1988__386_153023/} }
Andrew M. Winkler. Cusp forms and Hecke groups.. Journal für die reine und angewandte Mathematik, Tome 386 (1988), pp. 187-204. http://geodesic.mathdoc.fr/item/JRAM_1988__386_153023/