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@article{DAN_1980_253_6_a7, author = {R. S. Sadyrkhanov}, title = {A covering map criterion in domains of normed spaces}, journal = {Doklady Akademii Nauk}, pages = {1318--1322}, publisher = {mathdoc}, volume = {253}, number = {6}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1980_253_6_a7/} }
R. S. Sadyrkhanov. A covering map criterion in domains of normed spaces. Doklady Akademii Nauk, Tome 253 (1980) no. 6, pp. 1318-1322. http://geodesic.mathdoc.fr/item/DAN_1980_253_6_a7/