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References:
[1] Sedáček J.: Kombinatorika v teorii a praxi. NČSAV, Praha, 1964.
[2] Havel I., Morávek J.: $B$-valuations of graphs. Vyjde v Czech. Math. Journ. 22 (1972). MR 0294159 | Zbl 0247.05148
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