Une contribution au problème des quatre couleurs.
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Publication:1454249
DOI10.24033/BSMF.1080zbMATH Open51.0447.06OpenAlexW2584086818MaRDI QIDQ1454249
Author name not available (Why is that?)
Publication date: 1925
Published in: (Search for Journal in Brave)
Full work available at URL: http://www.numdam.org/item?id=BSMF_1925__53__42_1
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