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Regular major maps of at most 19 regions and their Q-chromials. (English) Zbl 0211.56603

MSC:
05C15 Coloring of graphs and hypergraphs
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References:
[1] Birkhoff, G.D; Lewis, D.C, Chromatic polynomials, Trans. amer. math. soc., 60, 355-451, (1946) · Zbl 0060.41601
[2] Bari, R, Absolute reducibility of maps of at most 19 regions, () · Zbl 0211.56603
[3] Berman, G; Tutte, W.T, The Golden root of a chromatic polynomial, J. combinatorial theory, 6, 301-302, (1969) · Zbl 0174.26604
[4] Tutte, W.T, On chromatic polynomials and the Golden ratio, J. combinatorial theory, 9, 289-296, (1970) · Zbl 0209.55001
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