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Homomorphieeigenschaften und mittlere Kantendichte von Graphen. (German) Zbl 0171.22405

Keywords:
topology
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References:
[1] Dirac, G. A.: Homomorphism theorems for graphs. Math. Ann.153, 69-80 (1964). · Zbl 0115.41005
[2] ?? On the structure of 5- and 6-chromatic abstract graphs. J. Reine Angew. Math.214/215, 43-52 (1964). · Zbl 0131.38403
[3] Jung, H. A.: Anwendung einer Methode von K. Wagner bei Färbungsproblemen für Graphen. Math. Ann.161, 325-326 (1965). · Zbl 0132.20703
[4] Wagner, K.: Beweis einer Abschwächung der Hadwiger-Vermutung. Math. Ann.153, 139-141 (1964). · Zbl 0192.30002
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