@article{10_4153_CMB_1965_052_0,
     author = {Dirac, G. A.},
     title = {Chromatic {Number} and {Topological} {Complete} {Subgraphs}},
     journal = {Canadian mathematical bulletin},
     pages = {711--715},
     year = {1965},
     volume = {8},
     number = {6},
     doi = {10.4153/CMB-1965-052-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-052-0/}
}