@article{DA_2015_22_2_a1,
     author = {V. G. Vizing},
     title = {On coloring problems for the two-season multigraphs},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {17--26},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2015_22_2_a1/}
}