@article{DA_2005_12_4_a1,
     author = {V. G. Vizing},
     title = {On the $(p,q)$-coloring of incidentors of an undirected multigraph},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {23--39},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2005_12_4_a1/}
}