Geodesic
On coloring problems for the two-season multigraphs
Diskretnyj analiz i issledovanie operacij, Tome 22 (2015) no. 2, pp. 17-26.

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It is supposed that there are two moments of time called seasons in which a multigraph can have various sets of edges. Such multigraphs are called two-season. In coloring vertices or edges every object is colored in one season. Some bounds on two-season chromatic number are given and the exact algorithm for the minimal edge coloring of a bipartite two-season multigraph is presented. Bibliogr. 3.
Keywords: two-season multigraph, two-season coloring. 
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V. G. Vizing. On coloring problems for the two-season multigraphs. Diskretnyj analiz i issledovanie operacij, Tome 22 (2015) no. 2, pp. 17-26. http://geodesic.mathdoc.fr/item/DA_2015_22_2_a1/

[1] V. G. Vizing, “On bases of vertices of a two-season directed graph”, Reports of Odessa Seminar on Discrete Mathematics, 15, Astroprint, Odessa, 2014, 13–16

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