no. R3
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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     zbl = {0239.05112},
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     url = {http://archive.numdam.org/item/M2AN_1971__5_3_3_0/}
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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/

[1] P. Camion, Characterization of totally unimodular matrice, Proc. Am. Math. Soc., vol. 16, n° 5, october 1965. | MR | Zbl

[2] A. Ghouila - Houri, Caractérisation des matrices totalement uni-modulaires, C. R. Acad. Sci. Paris, vol. 254, 1192. | MR | Zbl

[3] C. Berge, Théorie des graphes et des hypergraphes, Dunod, Paris, 1970. | Zbl

[4] C. Berge, Sur certains hypergraphes généralisant les graphes bipartites, pp. 119-133 in Combinatorial Theory and its Applications, Balatonfured (P. Erdös, A. Renyi, V. T. Sos, ed.) North-Holland Publishing Co., Amsterdam, London, 1970. | MR | Zbl

[5] C. Berge, Six papers on graph theory. Indian Statistical Institute, Calcutta, 1963.

[6] J. Folkman and D. R. Fulkerson, Edge Colorings in Bipartite Graphs, Chapter 31 in Combinatorial Mathematics and their Applications (R. C. Bose and T. A. Dowling, ed.), University of North Carolina Press, Chapel Hill, 1969). | MR | Zbl

[7] D. Werra, Some Combinatorial Problems Arising in Scheduling, Canad. Op. Res. Soc. Journal, vol. 8, n° 3, november 1970. | MR | Zbl