DOI10.4064/fm-32-1-193-200zbMath0021.42904OpenAlexW914316966MaRDI QIDQ5774926
Samuel Eilenberg, K. Kuratowski
Publication date: 1939 Published in: Fundamenta Mathematicae (Search for Journal in Brave) Full work available at URL: https://eudml.org/doc/213058
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