Geodesic
On coverings of topological spaces
Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. IV, Tome 148 (1951) no. 148, pp. 204-215 
Yu. M. Smirnov. On coverings of topological spaces. Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. IV, Tome 148 (1951) no. 148, pp. 204-215. http://geodesic.mathdoc.fr/item/UZMU_1951_148_148_a13/
@article{UZMU_1951_148_148_a13,
     author = {Yu. M. Smirnov},
     title = {On coverings of topological spaces},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {204--215},
     year = {1951},
     volume = {148},
     number = {148},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1951_148_148_a13/}
}
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