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@article{MAN_1967__168_161492, author = {R.A. Rankin}, title = {Hecke {Operators} on {Congruence} {Subgroups} of the {Modular} {Group}}, journal = {Mathematische Annalen}, pages = {40--58}, publisher = {mathdoc}, volume = {168}, year = {1967}, zbl = {0145.32001}, url = {http://geodesic.mathdoc.fr/item/MAN_1967__168_161492/} }
R.A. Rankin. Hecke Operators on Congruence Subgroups of the Modular Group. Mathematische Annalen, Tome 168 (1967), pp. 40-58. http://geodesic.mathdoc.fr/item/MAN_1967__168_161492/