A note on the independent Roman domination in unicyclic graphs
Mustapha Chellali, Nader Jafari Rad · Opuscula Mathematica · 2012
A Roman dominating function (RDF) on a graph G = (V, E) is a function f : V -→ {0, 1, 2} satisfying the condition that every vertex u for which f (u) = 0 is adjacent to at least one vertex v for which f (v) = 2.The weight of an RDF is the value