Subgroups of the (2,3,7) Triangle Group.
Stothers, W.Wilson
Manuscripta mathematica, Tome 22 (1977), p. 323-334 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1977-01-01
EUDML-ID : urn:eudml:doc:154447 
@article{GDZPPN002220148,
     title = {Subgroups of the (2,3,7) Triangle Group.},
     journal = {Manuscripta mathematica},
     volume = {22},
     year = {1977},
     pages = {323-334},
     zbl = {0355.20046},
     url = {http://dml.mathdoc.fr/item/GDZPPN002220148}
}

Stothers, W.Wilson. Subgroups of the (2,3,7) Triangle Group.. Manuscripta mathematica, Tome 22 (1977) pp. 323-334. http://gdmltest.u-ga.fr/item/GDZPPN002220148/