A Case of Coloration in the Four Color Problem
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Publication:5767203
DOI10.2307/2371577zbMath0017.13203OpenAlexW2331703606MaRDI QIDQ5767203
Publication date: 1937
Published in: American Journal of Mathematics (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.2307/2371577
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