Geodesic
Tr -Span of Directed Wheel Graphs
Discussiones Mathematicae. Graph Theory, Tome 38 (2018) no. 4, pp. 871-888

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In this paper, we consider T-colorings of directed graphs. In particular, we consider as a T-set the set Tr = 0, 1, 2, . . ., r−1, r+1, . . .. Exact values and bounds of the Tr-span of directed graphs whose underlying graph is a wheel graph are presented.
Keywords: T -coloring, digraph, wheel graph, span 
@article{DMGT_2018_38_4_a0,
     author = {Besson, Marc and Tesman, Barry},
     title = {T\protect\textsubscript{r} {-Span} of {Directed} {Wheel} {Graphs}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {871--888},
     publisher = {mathdoc},
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     number = {4},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2018_38_4_a0/}
}
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Besson, Marc; Tesman, Barry. Tr -Span of Directed Wheel Graphs. Discussiones Mathematicae. Graph Theory, Tome 38 (2018) no. 4, pp. 871-888. http://geodesic.mathdoc.fr/item/DMGT_2018_38_4_a0/