scientific article; zbMATH DE number 3387394
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Publication:5656797
zbMath0245.05126MaRDI QIDQ5656797
Publication date: 1972
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Extremal problems in graph theory (05C35) Combinatorial aspects of matroids and geometric lattices (05B35) Directed graphs (digraphs), tournaments (05C20)
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