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@article{MM2_1977__20_154447, author = {W.Wilson Stothers}, title = {Subgroups of the (2,3,7) {Triangle} {Group.}}, journal = {Manuscripta mathematica}, pages = {323--334}, publisher = {mathdoc}, volume = {20}, year = {1977}, zbl = {0355.20046}, url = {http://geodesic.mathdoc.fr/item/MM2_1977__20_154447/} }
W.Wilson Stothers. Subgroups of the (2,3,7) Triangle Group.. Manuscripta mathematica, Tome 20 (1977), pp. 323-334. http://geodesic.mathdoc.fr/item/MM2_1977__20_154447/