@article{10_4171_ggd_147,
     author = {Colin Maclachlan},
     title = {Commensurability classes of discrete arithmetic   hyperbolic groups},
     journal = {Groups, geometry, and dynamics},
     pages = {767--785},
     year = {2011},
     volume = {5},
     number = {4},
     doi = {10.4171/ggd/147},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/147/}
}