1. Borel A., Harish-Chandra.: Arithmetic subgroups of algebraic groups. Ann. of Math. (2) 75, 485–535 (1962)
2. A. Borel, Commensurability classes and volumes of hyperbolic 3-manifolds Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4) 8 (1981), 1–33.
3. T. Chinburg and M. Stover, Geodesic curves on Shimura surfaces,
http://arxiv.org/abs/1506.03299
.
4. V. Koziarz and J. Maubon, On the equidistribution of totally geodesic submanifolds in locally symmetric spaces and application to boundedness results for negative curves and exceptional divisors,
http://arxiv.org/abs/1407.6561
.
5. Maclachlan C., Reid A.W.: Commensurability classes of arithmetic Kleinian groups and their Fuchsian subgroups Math. Proc. Cambridge Philos. Soc. 102, 251–257 (1987)