On the principal congruence subgroups of the Hecke-group H(5).
Yılmaz Özgür, Nihal ; Cangül, İ. Naci
Beiträge zur Algebra und Geometrie, Tome 45 (2004), p. 75-85 / Harvested from The Electronic Library of Mathematics
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Publié le : 2004-01-01
EUDML-ID : urn:eudml:doc:227067 
@article{02096232,
     title = {On the principal congruence subgroups of the Hecke-group },
     journal = {Beitr\"age zur Algebra und Geometrie},
     volume = {45},
     year = {2004},
     pages = {75-85},
     zbl = {1059.11035},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02096232}
}

Yılmaz Özgür, Nihal; Cangül, İ. Naci. On the principal congruence subgroups of the Hecke-group . Beiträge zur Algebra und Geometrie, Tome 45 (2004) pp. 75-85. http://gdmltest.u-ga.fr/item/02096232/