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Un grafo cubico, non-planare, unicamente tricolorabile, di vita 5. (Italian) Zbl 0339.05104

MSC:
05C15 Coloring of graphs and hypergraphs
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References:
[1] D. Greenwell andH. Kronk,Uniquely line-colorable graphs, Canad. Math. Bull.16 (1973), 525–529. · Zbl 0275.05107
[2] S. Fiorini,On the chromatic index of a graph, III: Uniquely edge-colourable graphs, Quart. J. Math. (Oxford) (3)26 (1975), 129–140. · Zbl 0312.05104
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