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@article{JRAM_1964__0214_0215_150603, author = {G.A. Dirac}, title = {On the structure of 5- and 6-chromatic abstract graphs.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {43--52}, publisher = {mathdoc}, volume = {0214_0215}, year = {1964}, zbl = {0131.38403}, url = {http://geodesic.mathdoc.fr/item/JRAM_1964__0214_0215_150603/} }
G.A. Dirac. On the structure of 5- and 6-chromatic abstract graphs.. Journal für die reine und angewandte Mathematik, 0214_0215 (1964), pp. 43-52. http://geodesic.mathdoc.fr/item/JRAM_1964__0214_0215_150603/