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@article{DAN_1970_190_2_a6, author = {I. S. Ovchinnikov}, title = {Certain properties of plane and spatial mappings}, journal = {Doklady Akademii Nauk}, pages = {276--279}, publisher = {mathdoc}, volume = {190}, number = {2}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_190_2_a6/} }
I. S. Ovchinnikov. Certain properties of plane and spatial mappings. Doklady Akademii Nauk, Tome 190 (1970) no. 2, pp. 276-279. http://geodesic.mathdoc.fr/item/DAN_1970_190_2_a6/