Nonnegative signed Roman domination in graphs
J. Combin. Math. Combin. Comput. 110 (2019), 259--277.
BibTex references
@Article\{DV19b,
author = "Dehgardi, N. and Volkmann, Lutz",
title = "Nonnegative signed Roman domination in graphs",
journal = "J. Combin. Math. Combin. Comput.",
volume = "110",
pages = "259--277",
year = "2019",
}