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@article{JRAM_1974__0268_0269_151457, author = {G.A. Dirac}, title = {The number of edges in critical graphs.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {150--164}, publisher = {mathdoc}, volume = {0268_0269}, year = {1974}, zbl = {0298.05119}, url = {http://geodesic.mathdoc.fr/item/JRAM_1974__0268_0269_151457/} }
G.A. Dirac. The number of edges in critical graphs.. Journal für die reine und angewandte Mathematik, 0268_0269 (1974), pp. 150-164. http://geodesic.mathdoc.fr/item/JRAM_1974__0268_0269_151457/