The Roman domination number of a digraph
Acta Univ. Apulensis Math. Inform 27 (2011), 77-86.
BibTex references
@Article\{SV11,
author = "Sheikholeslami, S.M. and Volkmann, Lutz",
title = "The Roman domination number of a digraph",
journal = "Acta Univ. Apulensis Math. Inform",
volume = "27",
pages = "77-86",
year = "2011",
}