@article{JRAM_1978__0299_0300_151988,
     author = {John Mitchem},
     title = {A new proof of a theorem of {Dirac} on the number of edges in critical graphs.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {84--91},
     publisher = {mathdoc},
     volume = {0299_0300},
     year = {1978},
     zbl = {0367.05052},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__0299_0300_151988/}
}