Noncongruence subgroups of the Hecke groups G (...).
Journal für die reine und angewandte Mathematik, Tome 314 (1980), pp. 174-176
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@article{JRAM_1980__314_152216,
author = {Gareth A. Jones},
title = {Noncongruence subgroups of the {Hecke} groups {G} (...).},
journal = {Journal f\"ur die reine und angewandte Mathematik},
pages = {174--176},
publisher = {mathdoc},
volume = {314},
year = {1980},
zbl = {0417.10022},
url = {http://geodesic.mathdoc.fr/item/JRAM_1980__314_152216/}
}
Gareth A. Jones. Noncongruence subgroups of the Hecke groups G (...).. Journal für die reine und angewandte Mathematik, Tome 314 (1980), pp. 174-176. http://geodesic.mathdoc.fr/item/JRAM_1980__314_152216/