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[2]
EHRENFEUCHT A, 1981, ABSTR AMS, V2, P15
[3]
Ore O., 1967, 4 COLOR PROBLEM
[4]
A THEOREM ON COLORING THE LINES OF A NETWORK
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[5]
Vizing V.G., 1965, DISKRET ANAL, V5, P9
[6]
VIZING VG, 1965, CYBERNETICS, V3, P32
[7]
[No title captured]