Minimum coverings of a finite set
Doklady Akademii Nauk, Tome 207 (1972) no. 5, pp. 1066-1069.

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     author = {F. V. Shirokov and V. A. Signayevskiy},
     title = {Minimum coverings of a finite set},
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     year = {1972},
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     url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a13/}
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F. V. Shirokov; V. A. Signayevskiy. Minimum coverings of a finite set. Doklady Akademii Nauk, Tome 207 (1972) no. 5, pp. 1066-1069. http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a13/