A proof of the four color theorem
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Publication:1230791
DOI10.1016/0012-365X(76)90147-3zbMath0339.05109OpenAlexW4211129676MaRDI QIDQ1230791
Wolfgang Haken, Kenneth I. Appel
Publication date: 1976
Published in: Discrete Mathematics (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1016/0012-365x(76)90147-3
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