Publisher
Springer Science and Business Media LLC
Subject
Computational Mathematics,Algebra and Number Theory
Reference3 articles.
1. C. Berge,Graphes et hypergraphes (1970), Dunod, Paris.
2. E. Brown, L. Johnson,A class of planar four-colorable graphs, Israel Journal of Mathematics11 (1972), 53–56.
3. O. Ore,The four-color problem (1967), Academic Press, New York.
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