1. M.C. Gemignani, Elementry Topology, Second edition, Wesely Publishing Company, 1972.
2. K.P. Hart et al., Encyclopaedia of General Topology, Elsevier, North-Holland, 2004.
3. T.W. Haynes, Fundamental of Domination in Graphs, Marcel Dekker, Inc., 1998.
4. Hn-Domination in Graphs
5. A.A. Omran and R. Yasen, Some properties of Frame domination in graphs, JEAS 12(10 SI), 882–885 (2017).