[1] Atanassov, K. T. (1986) Intuitionistic fuzzy sets. Fuzzy Sets and Systems, 20, 87–96.
[2] Atanassov, K. T, Gargov, G. (1989) Interval-valued intuitionistic fuzzy sets. Fuzzy Sets and Systems, 31, 343–349.
[3] Buckley, J. J. (2006) Fuzzy probability and statistics. Springer.
[4] Goletsis, Y, Psarras, J, and Samouilidis, J. E. (2003) Project ranking in the armenian energy sector using a multi-criteria method for groups. Annals of Operations Research, 120 (1–4), 135–157.
[5] Grzegorzewski, P. (2002) Nearest interval approximation of a fuzzy number. Fuzzy Sets and Systems, 130, 321–330.
[6] Hsu, H. L, Wu, B. (2010) An innovative approach on fuzzy correlation coefficient with interval data. International Journal of Innovative Computing, Information and Control, 6(3), 1049–1058.
[7] Shen, F, Xu, J, and Xu, Z. (2015) An automatic ranking approach for multi-criteria group decision making under intuitionistic fuzzy environment. Fuzzy Optimization and Decision Making, 14 (3), 311–334.
[8] Xu, Z.S. (2012) Intuitionistic Fuzzy Aggregation and Clustering. Springer, Berlin: Heidelberg.
[9] Zadeh, L. A. (1965) Fuzzy sets. Information and Control, 8(3), 338–353.