The Roman {2}-domatic number of graphs
Discrete Appl. Math. 258 (2019), 235--241.
BibTex references
@Article\{Vol19b,
author = "Volkmann, Lutz",
title = "The Roman {2}-domatic number of graphs",
journal = "Discrete Appl. Math.",
volume = "258",
pages = "235--241",
year = "2019",
}