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@article{DAN_1983_273_1_a11, author = {R. S. Sadyrkhanov}, title = {A finite-to-one covering map criterion}, journal = {Doklady Akademii Nauk}, pages = {54--58}, publisher = {mathdoc}, volume = {273}, number = {1}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_1_a11/} }
R. S. Sadyrkhanov. A finite-to-one covering map criterion. Doklady Akademii Nauk, Tome 273 (1983) no. 1, pp. 54-58. http://geodesic.mathdoc.fr/item/DAN_1983_273_1_a11/