@article{DAN_1978_239_2_a3,
     author = {A. D. Mednykh},
     title = {Determination of the number of nonequivalent coverings over a compact {Riemann} surface},
     journal = {Doklady Akademii Nauk},
     pages = {269--271},
     publisher = {mathdoc},
     volume = {239},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_239_2_a3/}
}