Congruence subgroups of positive genus of the modular group
Knopp, M. I. ; Newman, M.
Illinois J. Math., Tome 9 (1965) no. 4, p. 577-583 / Harvested from Project Euclid
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Publié le : 1965-12-15
Classification:  20.65,  10.21 
@article{1256059298,
     author = {Knopp, M. I. and Newman, M.},
     title = {Congruence subgroups of positive genus of the modular group},
     journal = {Illinois J. Math.},
     volume = {9},
     number = {4},
     year = {1965},
     pages = { 577-583},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1256059298}
}

Knopp, M. I.; Newman, M. Congruence subgroups of positive genus of the modular group. Illinois J. Math., Tome 9 (1965) no. 4, pp.  577-583. http://gdmltest.u-ga.fr/item/1256059298/