@article{DAN_1979_244_3_a2,
     author = {A. D. Mednykh},
     title = {On unramified coverings of compact {Riemann} surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {529--532},
     publisher = {mathdoc},
     volume = {244},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_244_3_a2/}
}