Congruence subgroups of groups commensurable with PSL(2,ℤ) of genus 0 and 1.
Cummins, C.J.
Experimental Mathematics, Tome 13 (2004), p. 361-382 / Harvested from The Electronic Library of Mathematics
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Publié le : 2004-01-01
DOI : https://doi.org/10.1080/10586458.2004.10504547
EUDML-ID : urn:eudml:doc:52776 
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     title = {Congruence subgroups of groups commensurable with },
     journal = {Experimental Mathematics},
     volume = {13},
     year = {2004},
     pages = {361-382},
     doi = {10.1080/10586458.2004.10504547},
     zbl = {1099.11022},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05030101}
}

Cummins, C.J. Congruence subgroups of groups commensurable with . Experimental Mathematics, Tome 13 (2004) pp. 361-382. doi : 10.1080/10586458.2004.10504547. http://gdmltest.u-ga.fr/item/05030101/