no. 1
Commensurability classes and volumes of hyperbolic 3-manifolds
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 1, pp. 1-33. 
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     title = {Commensurability classes and volumes of hyperbolic 3-manifolds},
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Borel, A. Commensurability classes and volumes of hyperbolic 3-manifolds. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 1, pp. 1-33. http://www.numdam.org/item/ASNSP_1981_4_8_1_1_0/

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