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Kibernetika, Vol. 1, No. 3, pp. 29–39, 1965
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Vizing, V.G. The chromatic class of a multigraph. Cybern Syst Anal 1, 32–41 (1965). https://doi.org/10.1007/BF01885700
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DOI: https://doi.org/10.1007/BF01885700