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Publication:3677782
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zbMath0564.05026MaRDI QIDQ3677782

Yanpei Liu

Publication date: 1985


Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

four colour problemplanar graph theory


Mathematics Subject Classification ID

Planar graphs; geometric and topological aspects of graph theory (05C10) Coloring of graphs and hypergraphs (05C15)


Related Items (1)

Transportation networks: Old and new







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