no. 4
A relation between the approximated versions of minimum set covering, minimum vertex covering and maximum independent set
RAIRO - Operations Research - Recherche Opérationnelle, Tome 28 (1994) no. 4, pp. 413-433. 
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     author = {Paschos, V. Th.},
     title = {A relation between the approximated versions of minimum set covering, minimum vertex covering and maximum independent set},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {413--433},
     publisher = {EDP-Sciences},
     volume = {28},
     number = {4},
     year = {1994},
     mrnumber = {1304252},
     zbl = {0857.90130},
     language = {en},
     url = {http://www.numdam.org/item/RO_1994__28_4_413_0/}
}
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Paschos, V. Th. A relation between the approximated versions of minimum set covering, minimum vertex covering and maximum independent set. RAIRO - Operations Research - Recherche Opérationnelle, Tome 28 (1994) no. 4, pp. 413-433. http://www.numdam.org/item/RO_1994__28_4_413_0/

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