@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/}
}