Geodesic
Radio k-labelings for Cartesian products of graphs
Discussiones Mathematicae. Graph Theory, Tome 28 (2008) no. 1, pp. 165-178

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Frequency planning consists in allocating frequencies to the transmitters of a cellular network so as to ensure that no pair of transmitters interfere. We study the problem of reducing interference by modeling this by a radio k-labeling problem on graphs: For a graph G and an integer k ≥ 1, a radio k-labeling of G is an assignment f of non negative integers to the vertices of G such that
Keywords: graph theory, radio channel assignment, radio k-labeling, Cartesian product, radio number, antipodal number 
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Kchikech, Mustapha; Khennoufa, Riadh; Togni, Olivier. Radio k-labelings for Cartesian products of graphs. Discussiones Mathematicae. Graph Theory, Tome 28 (2008) no. 1, pp. 165-178. http://geodesic.mathdoc.fr/item/DMGT_2008_28_1_a11/