@article{DAN_1986_290_4_a4,
     author = {A. N. Protopopov},
     title = {Homeomorphisms of branched coverings of a two-dimensional sphere},
     journal = {Doklady Akademii Nauk},
     pages = {792--795},
     publisher = {mathdoc},
     volume = {290},
     number = {4},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_290_4_a4/}
}