Geodesic
Product rosy labeling of graphs
Discussiones Mathematicae. Graph Theory, Tome 28 (2008) no. 3, pp. 431-439

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In this paper we describe a natural extension of the well-known ρ-labeling of graphs (also known as rosy labeling). The labeling, called product rosy labeling, labels vertices with elements of products of additive groups. We illustrate the usefulness of this labeling by presenting a recursive construction of infinite families of trees decomposing complete graphs.
Keywords: graph decomposition, graph labeling 
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     title = {Product rosy labeling of graphs},
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Fronček, Dalibor. Product rosy labeling of graphs. Discussiones Mathematicae. Graph Theory, Tome 28 (2008) no. 3, pp. 431-439. http://geodesic.mathdoc.fr/item/DMGT_2008_28_3_a3/