An introduction to the twin signed total k-domination number in directed graphs
RAIRO -- Operations Research 51 (2017), 1331--1343.
BibTex references
@Article\{ADV17,
author = "Atapour, M. and Dehgardi, N. and Volkmann, Lutz",
title = "An introduction to the twin signed total k-domination number in directed graphs",
journal = "RAIRO -- Operations Research",
volume = "51",
pages = "1331--1343",
year = "2017",
}