@article{GDZPPN002194759,
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},
volume = {302},
year = {1978},
pages = {84-91},
zbl = {0367.05052},
url = {http://dml.mathdoc.fr/item/GDZPPN002194759}
}
Mitchem, John. A new proof of a theorem of Dirac on the number of edges in critical graphs.. Journal für die reine und angewandte Mathematik, Tome 302 (1978) pp. 84-91. http://gdmltest.u-ga.fr/item/GDZPPN002194759/