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@article{DAN_1978_242_3_a7, author = {G. A. Margulis}, title = {Factor groups of discrete subgroups}, journal = {Doklady Akademii Nauk}, pages = {533--536}, publisher = {mathdoc}, volume = {242}, number = {3}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_242_3_a7/} }
G. A. Margulis. Factor groups of discrete subgroups. Doklady Akademii Nauk, Tome 242 (1978) no. 3, pp. 533-536. http://geodesic.mathdoc.fr/item/DAN_1978_242_3_a7/