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Simultaneous colouring of 4-valent maps. (English) Zbl 0213.50704

MSC:
05C15 Coloring of graphs and hypergraphs
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References:
[1] Brooks R. L.: On colouring the nodes of a network. Proc. Cambridge Philos. Soc. 37 (1941), 194-197. · Zbl 0027.26403
[2] Fiamčík J., Jucovič E.: Colouring the edges of a multirgraph. Arch. Math. 21 (1970), 446 448. · Zbl 0203.26501
[3] Izbicki H.: Verallgemeinerte Farbenzahlen, Beiträge zur Graphentheorie. Internat. Kolloq., Manebach 1967, Leipzig 1968, 81-83.
[4] Jucovič E.: On a problem in map colouring. Mat. časop. 19 (1969), 225-227.
[5] Ore O.: The four-color problem. New York 1967. · Zbl 0149.21101
[6] Ringel G.: Ein Sechsfarbenproblem auf der Kugel. Abhandl. math. Semin. Univ. Hamburg 29 (1965), 107-117. · Zbl 0132.20701
[7] Визинг В. Г.: O6 оцєнкє хромамучєского класса р-графа. Дискр. анализ 3 (1964), 25-30.
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