@article{PPN266833020_0197+dmdlog12,
title = {Theta Series on the Hecke Groups G(...2) and G(...3).},
journal = {Mathematische Zeitschrift},
volume = {199},
year = {1988},
pages = {69-96},
zbl = {0632.10024},
url = {http://dml.mathdoc.fr/item/PPN266833020_0197+dmdlog12}
}
Köhler, Günter. Theta Series on the Hecke Groups G(...2) and G(...3).. Mathematische Zeitschrift, Tome 199 (1988) pp. 69-96. http://gdmltest.u-ga.fr/item/PPN266833020_0197+dmdlog12/