%0 Journal Article %A Dirac, G. A. %T Chromatic Number and Topological Complete Subgraphs %J Canadian mathematical bulletin %D 1965 %P 711-715 %V 8 %N 6 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-052-0/ %R 10.4153/CMB-1965-052-0 %F 10_4153_CMB_1965_052_0