Non-congruence subgroups for the Hecke groups $G(\surd 2)$ and $G(\surd 3)$
Parson, L. Alayne
Illinois J. Math., Tome 19 (1975) no. 4, p. 79-86 / Harvested from Project Euclid
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Publié le : 1975-03-15
Classification:  10D05,  20H05 
@article{1256050926,
     author = {Parson, L. Alayne},
     title = {Non-congruence subgroups for the Hecke groups $G(\surd 2)$ and $G(\surd 3)$},
     journal = {Illinois J. Math.},
     volume = {19},
     number = {4},
     year = {1975},
     pages = { 79-86},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1256050926}
}

Parson, L. Alayne. Non-congruence subgroups for the Hecke groups $G(\surd 2)$ and $G(\surd 3)$. Illinois J. Math., Tome 19 (1975) no. 4, pp.  79-86. http://gdmltest.u-ga.fr/item/1256050926/