@article{DA_2000_7_3_a1,
     author = {V. G. Vizing},
     title = {The coloring of the incidentors and vertices of a~directed multigraph},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {6--16},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2000_7_3_a1/}
}