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@article{DAN_1984_279_1_a9, author = {M. Sh. Farber}, title = {Mappings into a circle with a minimal number of critical points}, journal = {Doklady Akademii Nauk}, pages = {43--46}, publisher = {mathdoc}, volume = {279}, number = {1}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1984_279_1_a9/} }
M. Sh. Farber. Mappings into a circle with a minimal number of critical points. Doklady Akademii Nauk, Tome 279 (1984) no. 1, pp. 43-46. http://geodesic.mathdoc.fr/item/DAN_1984_279_1_a9/