An upper bound on the double Roman domination number
J. Comb. Optim. 36 (2018), 81--89.
BibTex references
@Article\{ANSV18,
author = "Amjadi, J. and Nazari-Moghaddam, S. and Sheikholeslami, S.M. and Volkmann, Lutz",
title = "An upper bound on the double Roman domination number",
journal = "J. Comb. Optim.",
volume = "36",
pages = "81--89",
year = "2018",
}