Jean E. Dunbar Wayne Goddard Stephen T. Hedetniemi Alice A. McRae Michael A. Henning The Algorithmic Complexity of Minus Domination in Graphs. 73-84 1996 68 Discrete Applied Mathematics 1-2 http://dx.doi.org/10.1016/0166-218X(95)00056-W db/journals/dam/dam68.html#DunbarGHMH96