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Subgroups of finite index of Fuchsian groups

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This research was done independently by Hoare and Karrass-Solitar and was supported in part by grants from the National Research Council of Canada, Grant #A5602 and Grant #A5614.

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Hoare, A.H.M., Karrass, A. & Solitar, D. Subgroups of finite index of Fuchsian groups. Math Z 120, 289–298 (1971). https://doi.org/10.1007/BF01109993

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