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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1968 Jun;60(2):438–445. doi: 10.1073/pnas.60.2.438

SOLUTION OF THE HEAWOOD MAP-COLORING PROBLEM*

Gerhard Ringel 1, J W T Youngs 1
PMCID: PMC225066  PMID: 16591648

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