1. Grzegorzewski, P. 1998. Metrics and orders in space of fuzzy numbers. Fuzzy Sets and System 97: 83–94.
2. Kumar, A., P. Shing, and A. Kaur. 2010. Ranking of generalized exponential fuzzy numbers using integral value approach. International Journal of Advance Soft Computing Application 2: 1–10.
3. Zadeh, A.L. 1965. Fuzzy Sets. Information and Computation 8: 338–353.
4. Chakraborty, D., K.D. Jana, and K.T. Roy. 2014. Multi-objective multi-item solid transportation problem with fuzzy inequality constraints. Journal of Inequalities and Applications 1: 1–21.
5. Zadeh, A.L. 1978. Fuzzy sets as a basis for a theory of possibility. Fuzzy Sets and system 1: 3–28.