The signed k-domination number of directed graphs
Cent. Eur. J. Math. 8 (2010), 1048--1057.
BibTex references
@Article\{AHSV10,
author = "Atapour, M. and Hajypory, R. and Sheikholeslami, S.M. and Volkmann, Lutz",
title = "The signed k-domination number of directed graphs",
journal = "Cent. Eur. J. Math.",
volume = "8",
pages = "1048--1057",
year = "2010",
}