On the isomorphism of discrete subgroups of ${\rm SL}(2, R)$.
Sitaram, Alladi
Michigan Math. J., Tome 22 (1976) no. 3, p. 31-32 / Harvested from Project Euclid
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Publié le : 1976-05-14
Classification:  22E40,  10D05 
@article{1029001618,
     author = {Sitaram, Alladi},
     title = {On the isomorphism of discrete subgroups of ${\rm SL}(2, R)$.},
     journal = {Michigan Math. J.},
     volume = {22},
     number = {3},
     year = {1976},
     pages = { 31-32},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1029001618}
}

Sitaram, Alladi. On the isomorphism of discrete subgroups of ${\rm SL}(2, R)$.. Michigan Math. J., Tome 22 (1976) no. 3, pp.  31-32. http://gdmltest.u-ga.fr/item/1029001618/