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@article{MZ_1988__197_1_183719, author = {G\"unter K\"ohler}, title = {Theta {Series} on the {Hecke} {Groups} {G(...2)} and {G(...3).}}, journal = {Mathematische Zeitschrift}, pages = {69--96}, publisher = {mathdoc}, volume = {197}, number = {1}, year = {1988}, zbl = {0632.10024}, url = {http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183719/} }
Günter Köhler. Theta Series on the Hecke Groups G(...2) and G(...3).. Mathematische Zeitschrift, Tome 197 (1988) no. 1, pp. 69-96. http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183719/