Florica Kramer

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In 1969 we defined in [8] and [9] the chromatic number γ(p,G) relative to distance p of a graph G to be the minimum number of colours sufficing for colouring the vertices of G in such a way that any two vertices of G of distance not greater than p have distinct colours. We gave also a characterization of the graphs for which we have γ(p,G) = p + 1. The same(More)
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