1. Allan, R., Laskar, R. and Hedetniemi, S., A note on total domination, Discrete Mathematics, 49, 1984, 7–13.
2. Arumugam, S. and Thuraiswamy, A., Total domination in graphs, Ars Combinatoria, 43, 1996, 89–92.
3. Atapourm, M. and Soltankhah, N., On total dominating sets in graphs, International Journal of Contemporary Mathematical Sciences, 4, 2009, 253–257.
4. Blidia, M., Chellali, M. and Volkmann, L., Bounds of the 2-domination number of graphs, Utilitas Mathematica, 71, 2006, 209–216.
5. Blidia, M., Favaron, O. and Lounes, R., Locating-domination, 2-domination and independence in trees, Australasian Journal of Combinatorics, 42, 2008, 309–316.