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. 
@article{ASNSP_1981_4_8_1_1_0,
     author = {Borel, Armand},
     title = {Commensurability classes and volumes of hyperbolic 3-manifolds},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {1--33},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 8},
     number = {1},
     year = {1981},
     zbl = {0473.57003},
     mrnumber = {616899},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1981_4_8_1_1_0/}
}
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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