Two-sheeted branched coverings of the three-dimensional sphere
Zapiski Nauchnykh Seminarov POMI, Investigations in topology, Tome 36 (1973), pp. 6-39

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@article{ZNSL_1973_36_a1,
     author = {O. Ya. Viro},
     title = {Two-sheeted branched coverings of the three-dimensional sphere},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {6--39},
     publisher = {mathdoc},
     volume = {36},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_36_a1/}
}
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O. Ya. Viro. Two-sheeted branched coverings of the three-dimensional sphere. Zapiski Nauchnykh Seminarov POMI, Investigations in topology, Tome 36 (1973), pp. 6-39. http://geodesic.mathdoc.fr/item/ZNSL_1973_36_a1/