1. F.R. Giordano, W.P. Fox, and S.B. Horton, A Course in Mathematical Modeling (2000).
2. Fuzzy sets
3. Modern Trends in Fuzzy Graph Theory
4. M. Akram, Middle-East J. Sci. Res. 11, 1641 (2012).
5. R. Muthuraj and A. Sasireka, Int. J. Res. Appl. Sci. Eng. Technol. 109 (2017).