摘要:
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sci-hub.se 参考文章(5)
G. Dirac, The structure of k-chromatic graphs Fundamenta Mathematicae. ,vol. 40, pp. 42- 55 ,(1953) , 10.4064/FM-40-1-42-55
G. A. Dirac, A Property of 4-Chromatic Graphs and some Remarks on Critical Graphs Journal of the London Mathematical Society. ,vol. s1-27, pp. 85- 92 ,(1952) , 10.1112/JLMS/S1-27.1.85
NG De Bruijn, Pál Erdos, None, A Colour Problem for Infinite Graphs and a Problem in the Theory of Relations Indagationes Mathematicae (Proceedings). ,vol. 54, pp. 371- 373 ,(1951) , 10.1016/S1385-7258(51)50053-7
G. A. Dirac, The Colouring of Maps Journal of the London Mathematical Society. ,vol. s1-28, pp. 476- 480 ,(1953) , 10.1112/JLMS/S1-28.4.476
G. A. Dirac, Note on the colouring of graphs Mathematische Zeitschrift. ,vol. 54, pp. 347- 353 ,(1951) , 10.1007/BF01238034