%0 Journal Article %A Chen, Xiaodan %A Hao, Guoliang %A Volkmann, Lutz %T Bounds on the Signed Roman k-Domination Number of a Digraph %J Discussiones Mathematicae. Graph Theory %D 2019 %P 67-79 %V 39 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGT_2019_39_1_a6/ %G en %F DMGT_2019_39_1_a6