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==References==
*{{citation|last=Beardon|first=Alan F.|title=The geometry of discrete groups|series=Graduate Texts in Mathematics|volume= 91|publisher =
Springer-Verlag|year=1983 |isbn= 0-387-90788-2}}
*{{citation|last=Caratheodory|first=C.|authorlink=Constantin Caratheodory|title=Theory of functions of a complex variable. Vol. 2.|translator=F. Steinhardt. |publisher=Chelsea Publishing Company|year= 1954}}
*{{citation|last=de Rham|first=G.|authorlink=Georges de Rham|title=Sur les polygones générateurs de groupes fuchsiens|journal= Enseignement Math.|volume= 17 |year=1971|pages= 49–61}}
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