Geodesic
On the coverings of a graph by a system of neighborhoods of its vertices
Doklady Akademii Nauk, Tome 158 (1964) no. 1, pp. 21-24.

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     author = {F. Ya. Vetukhnovskii},
     title = {On the coverings of a graph by a system of neighborhoods of its vertices},
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     year = {1964},
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     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a3/}
}
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F. Ya. Vetukhnovskii. On the coverings of a graph by a system of neighborhoods of its vertices. Doklady Akademii Nauk, Tome 158 (1964) no. 1, pp. 21-24. http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a3/