Subgroups of Infinite Index in Fuchsian Groups.
Hoare, A. Howard M. ; Karrass, Abraham
Mathematische Zeitschrift, Tome 129 (1972), p. 59-69 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1972-01-01
EUDML-ID : urn:eudml:doc:171689 
@article{GDZPPN00241046X,
     title = {Subgroups of Infinite Index in Fuchsian Groups.},
     journal = {Mathematische Zeitschrift},
     volume = {129},
     year = {1972},
     pages = {59-69},
     zbl = {0223.20054},
     url = {http://dml.mathdoc.fr/item/GDZPPN00241046X}
}

Hoare, A. Howard M.; Karrass, Abraham. Subgroups of Infinite Index in Fuchsian Groups.. Mathematische Zeitschrift, Tome 129 (1972) pp. 59-69. http://gdmltest.u-ga.fr/item/GDZPPN00241046X/