@article{SEMR_2012_9_a19,
     author = {Tommy Jensen and Mark Siggers},
     title = {On a question of {Dirac} on critical and vertex critical graphs},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {156--160},
     publisher = {mathdoc},
     volume = {9},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2012_9_a19/}
}