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A proof of Grünbaum’s conjecture on the acyclic 5-colorability of planar graphs. (English. Russian original) Zbl 0363.05031
Sov. Math., Dokl. 17(1976), 1499-1502 (1977); translation from Dokl. Akad. Nauk SSSR 231, 18-20 (1976).

MSC:
05C15 Coloring of graphs and hypergraphs
05C10 Planar graphs; geometric and topological aspects of graph theory
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