1. [1] T.W. Haynes, S.T. Hedetniemi, and P.J. Slater, Fundamentals of Domination in Graphs, Marcel Dekker, New York, 1998.
2. [2] T.W. Haynes, S.T. Hedetniemi, and P.J. Slater, Domination in Graphs: Advanced Topics, Marcel Dekker, New York, 1998.
3. [3] G. Chartrand, P. Dankelmann, M. Schultz, and H.C. Swart, “Twin domination in digraphs,” Ars Combinatoria, vol.67, pp.105-114, 2003.
4. [4] T. Araki, “The k-tuple twin domination in de Bruijn and Kautz digraphs,” Discrete Mathematics, vol.308, pp.6406-6413, 2008.
5. [5] T. Araki, “Connected twin domination in de Bruijn and Kautz digraphs,” Discrete Mathematics, vol.309, pp.6229-6234, 2009.