@article{DA_2006_13_4_a1,
     author = {V. G. Vizing},
     title = {On bounds for the incidentor chromatic number of a~directed weighted multigraph},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {18--25},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2006_13_4_a1/}
}