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@article{DAN_1988_300_4_a8, author = {R. S. Sadyrkhanov}, title = {The openness of mappings with singularities in {Banach} spaces}, journal = {Doklady Akademii Nauk}, pages = {808--810}, publisher = {mathdoc}, volume = {300}, number = {4}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1988_300_4_a8/} }
R. S. Sadyrkhanov. The openness of mappings with singularities in Banach spaces. Doklady Akademii Nauk, Tome 300 (1988) no. 4, pp. 808-810. http://geodesic.mathdoc.fr/item/DAN_1988_300_4_a8/