%0 Journal Article %A Besson, Marc %A Tesman, Barry %T Tr -Span of Directed Wheel Graphs %J Discussiones Mathematicae. Graph Theory %D 2018 %P 871-888 %V 38 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGT_2018_38_4_a0/ %G en %F DMGT_2018_38_4_a0