The double Roman domatic number of a digraph
Discuss. Math. Graph Theory 40 (2020), 995--1004.
BibTex references
@Article\{Vol20a,
author = "Volkmann, Lutz",
title = "The double Roman domatic number of a digraph",
journal = "Discuss. Math. Graph Theory",
volume = "40",
pages = "995--1004",
year = "2020",
}