Chen, S. H,. Hsieh, C. H (1999) Graded mean integration representation of generalized fuzzy number. J. Chin. Fuzzy Syst, 5(2), 1-7.
 Figueroa, J.C. (2009) Solving Fuzzy Linear Programming Problems with Interval Type-2 RHS. Proceedings of the 2009 IEEE International Conference on Systems, Man, and Cybernetics San Antonio, TX, USA, October.
 Figueroa, J.C. (2011) Interval type-2 fuzzy linear programming: Uncertain constraints. In: 2011 IEEE Symposium Series on Computational Intelligence.
 Hisdal, E. (1981) The IF THEN ELSE Statement and Interval-Valued Fuzzy sets of Higher Type. International Journal of Man-Machine Studies, 15, 385-455.
 Javanmard, M,. Mishmast Nehi, H. (2017) Interval type-2 triangular fuzzy numbers;New ranking method and evaluation of some reasonable properties on it. 5th Iranian Joint Congress on Fuzzy and Intelligent Systems, CFIS, 8003587, 4-6.
 Javanmard, M. Mishmast Nehi, H. (2018) Rankings and operations for interval type-2 fuzzy numbers: a review and some new methods, Journal of Applied Mathematics and Computing. DOI: https://doi.org/10.1007/s12190-018-1193-9, First Online: 31 May 2018.
 Javanmard, M,. Mishmast Nehi, H. (2019) A Solving Method for Fuzzy Linear Programming Problem with Interval Type-2 Fuzzy Numbers. Int. J. Fuzzy Syst, DOI: https://doi.org/10.1007/s40815-018-0591-3, Published Online: 17 January.
 Kaufmann, A,. Gupta, M (1985) Introduction to fuzzy arithmetic theory and applications. Van Nostran Reinhold Co. Inc., New York.
 Mendel, J.M,. John, R.I,. Liu, F.L (2006) Interval type-2 fuzzy logical systems made simple. IEEE Transactions on Fuzzy Systems, 14, 808-821.
 Yager, R. R. (1978) Ranking fuzzy subsets over the unit interval. in Proceedings of the 17th IEEE International Conference on Decision and Control, San Diago, California, pp, 1435-1437.
 Zadeh, L.A. (1965) Fuzzy sets. Information And Control, 8, 338-353.
 Zadeh, L.A. (1975a) The concept of linguistic variable and its application to approximate reasoning-1. Information Sciences, 8, 199-249.
 Zadeh, L.A. (1975b) The concept of linguistic variable and its application to approximate reasoning-1. Information Sciences, 8, 301-357.
 Zadeh, L.A. (1975c) The concept of linguistic variable and its application to approximate reasoning-1. Information Sciences, 9, 43-80.