1. Atanassov K (1986) Intuitionistic fuzzy sets. Fuzzy Sets Syst 20:87–96
2. Zadeh LA (1965) Fuzzy sets. Inf Control 8(5):338–356
3. Chen TY (2011) Experimental analysis of score functions in multi-criteria decision-making with intuitionistic fuzzy sets. J Chin Inst of Ind Eng 28(3):206–225
4. Liu F, Yuan XH (2007) Fuzzy number intuitionistic fuzzy set. Fuzzy Syst Math 21(1):88–91
5. Wang XF (2008) Fuzzy number intuitionistic fuzzy geometric aggregation operators and their application to decision making. Control Decis 23(6):607–612