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@article{MZ_1972__125_171689, author = {A. Howard M. Hoare and Abraham Karrass}, title = {Subgroups of {Infinite} {Index} in {Fuchsian} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {59--69}, publisher = {mathdoc}, volume = {125}, year = {1972}, zbl = {0223.20054}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171689/} }
A. Howard M. Hoare; Abraham Karrass. Subgroups of Infinite Index in Fuchsian Groups.. Mathematische Zeitschrift, Tome 125 (1972), pp. 59-69. http://geodesic.mathdoc.fr/item/MZ_1972__125_171689/