@article{DAN_1964_155_2_a3,
     author = {L. D. Ivanov},
     title = {Smooth mappings of the space $R_n$ into $R_1$},
     journal = {Doklady Akademii Nauk},
     pages = {258--261},
     publisher = {mathdoc},
     volume = {155},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_2_a3/}
}