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Improved bounds for the product of the domination and chromatic numbers of a graph. (English summary) Ars Combin. 56 (2000), 189–191. Summary: “In this note we solve almost completely a problem raised by J. Topp and L. Volkmann [Discrete Math. 118 (1993), no. 1-3, 289–292 MR1230075] concerning the product of the domination and the chromatic numbers of a graph.