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Planar graphs without cycles of length from 4 to 7 are 3-colorable.
Oleg V. Borodin
Alexei N. Glebov
André Raspaud
Mohammad R. Salavatipour
Published in:
J. Comb. Theory, Ser. B (2005)
Keyphrases
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planar graphs
minimum weight
pairwise
weighted graph