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Edmonds, A.L., Ewing, J.H. & Kulkarni, R.S. Torsion free subgroups of fuchsian groups and tessellations of surfaces. Invent Math 69, 331–346 (1982). https://doi.org/10.1007/BF01389358
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DOI: https://doi.org/10.1007/BF01389358