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Publication:3869374
zbMath0432.05025MaRDI QIDQ3869374
Douglas R. Woodall, Robin J. Wilson
Publication date: 1978
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
graph colouringfour-color theoremdischargingunavoidable setsreducible configurationsAppel-Haken proof
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