@article{DAN_1967_172_4_a6,
     author = {A. V. Zarelua},
     title = {On finite-to-one mappings},
     journal = {Doklady Akademii Nauk},
     pages = {775--778},
     publisher = {mathdoc},
     volume = {172},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_4_a6/}
}