1. A. Alwardi, B. Arsić. I. Gutman, N. D. Soner, The Common Neighborhood Graph and its Energy, Iranian Journal of Mathe-matical Sciences and Informatics, Vol. 7, No. 2 (2012), pp 1–8.
2. Symmetry properties of subdivision graphs
3. B. D. Acharya, M. N. Vartak, Open neighbourhood graphs, Indian Institute of Technology, Dept. of Mathematics Research Report No.7, Bombay-40O 076, India, (1973).
4. D. Cvetcović, Graphs and their spectra, (Thesis), Univ. Beograd,Publ. Elektrotehn. Fak. Ser. Mat. Fiz. 354-356 (1971), pp 1–50.
5. D. Cvetcović, M. Doob, H. Sachs, Spectra of Graphs - Theory and application, academic press, New York, 1980.