Normal congruence subgroups of the Hecke groups $G(2^{(1/2)})$ and $G(3^{(1/2)})$.
Parson, L. Alayne
Pacific J. Math., Tome 73 (1977) no. 2, p. 481-487 / Harvested from Project Euclid
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Publié le : 1977-05-14
Classification:  10D05,  20H10 
@article{1102811933,
     author = {Parson, L. Alayne},
     title = {Normal congruence subgroups of the Hecke groups $G(2^{(1/2)})$ and $G(3^{(1/2)})$.},
     journal = {Pacific J. Math.},
     volume = {73},
     number = {2},
     year = {1977},
     pages = { 481-487},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102811933}
}

Parson, L. Alayne. Normal congruence subgroups of the Hecke groups $G(2^{(1/2)})$ and $G(3^{(1/2)})$.. Pacific J. Math., Tome 73 (1977) no. 2, pp.  481-487. http://gdmltest.u-ga.fr/item/1102811933/