Twin signed domination numbers in directed graphs
Algebra Discrete Math. 24 (2017), 71--89.
BibTex references
@Article\{ANSV17a,
author = "Atapour, M. and Norouzian, S. and Sheikholeslami, S.M. and Volkmann, Lutz",
title = "Twin signed domination numbers in directed graphs",
journal = "Algebra Discrete Math.",
volume = "24",
pages = "71--89",
year = "2017",
}