Equitable colorations of graphs
Revue française d'informatique et de recherche opérationnelle. Série rouge, Tome 5 (1971) no. R3, pp. 3-8. 
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     title = {Equitable colorations of graphs},
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de Werra, D. Equitable colorations of graphs. Revue française d'informatique et de recherche opérationnelle. Série rouge, Tome 5 (1971) no. R3, pp. 3-8. http://archive.numdam.org/item/M2AN_1971__5_3_3_0/

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