Katedra diskretni matematiky a statistiky Technicke university, Voronezska 13, 461 17 Liberec 1, Czech Republic
Abstract: Two numerical invariants $\Delta(G)$ and $\Gamma(G)$ of a graph, related to the concept of median, are studied.
Keywords: valence, median, pairing
Classification (MSC 1991): 05C38, 05C75
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