@article{DAN_1981_259_1_a9,
     author = {R. S. Sadyrkhanov},
     title = {Some properties of finite-to-one covering maps and their applications},
     journal = {Doklady Akademii Nauk},
     pages = {44--49},
     publisher = {mathdoc},
     volume = {259},
     number = {1},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_259_1_a9/}
}