A dominating set D of a graph G = (V;E) is non-split dominating set ifhV n Di is connected. The non-split domination number of G is the minimum cardinality of a non-split dominating set inG. LetD be a minimum dominating set inG. If a subset D 0 of V n D is dominating in G, then D 0 is called an inverse dominating set with respect to D. Furthermore, if