Geodesic
Linear and cyclic radio k-labelings of trees
Discussiones Mathematicae. Graph Theory, Tome 27 (2007) no. 1, pp. 105-123

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Motivated by problems in radio channel assignments, we consider radio k-labelings of graphs. For a connected graph G and an integer k ≥ 1, a linear radio k-labeling of G is an assignment f of nonnegative integers to the vertices of G such that
Keywords: graph theory, radio channel assignment, cyclic and linear radio k-labeling 
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Kchikech, Mustapha; Khennoufa, Riadh; Togni, Olivier. Linear and cyclic radio k-labelings of trees. Discussiones Mathematicae. Graph Theory, Tome 27 (2007) no. 1, pp. 105-123. http://geodesic.mathdoc.fr/item/DMGT_2007_27_1_a9/