Double Roman domination in digraphs
Bull. Malays. Math. Sci. Soc. 42 (2019), 1907--1920.
BibTex references
@Article\{HCV19a,
author = "Hao, Guoliang and Chen, Xiaodan and Volkmann, Lutz",
title = "Double Roman domination in digraphs",
journal = "Bull. Malays. Math. Sci. Soc.",
volume = "42",
pages = "1907--1920",
year = "2019",
}