The triangle groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 89 (1993), pp. 103-111. 
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     volume = {89},
     year = {1993},
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     url = {http://archive.numdam.org/item/RSMUP_1993__89__103_0/}
}
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Albar, Muhammad A.; Al-Hamdan, Walid M. The triangle groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 89 (1993), pp. 103-111. http://archive.numdam.org/item/RSMUP_1993__89__103_0/

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