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Tretkoff, P. (2016-02-16). Appendix A Torsion-Free Subgroups of Finite Index by Hans-Christoph Im Hof. In  (Ed.), Complex Ball Quotients and Line Arrangements in the Projective Plane (MN-51). : Princeton University Press,. Retrieved 22 Sep. 2018, from http://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691144771.001.0001/upso-9780691144771-appendix-001.