@article{DA_2013_20_1_a0,
     author = {V. G. Vizing},
     title = {Half-chromatic number of graph},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {3--11},
     year = {2013},
     volume = {20},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2013_20_1_a0/}
}