@article{MZM_2006_79_5_a10,
     author = {S. V. Savchenko},
     title = {On the number of noncritical vertices in strongly connected digraphs},
     journal = {Matemati\v{c}eskie zametki},
     pages = {743--755},
     publisher = {mathdoc},
     volume = {79},
     number = {5},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_79_5_a10/}
}