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3 W. L. Gau, "Vague sets" 23 (23): 610-614, 1993
4 Z. Xu, "Some geometric aggregation operators based on intuitionistic fuzzy sets" 35 (35): 417-433, 2006
5 W. S. Du, "Research on arithmetic operations over generalized orthopair fuzzy sets" 34 : 709-732, 2019
6 S. Y. Cho, "Reliability analysis of fuzzy systems with weighted components using interval valued vague sets" 3 (3): 31-40, 2008
7 조상엽, "Reliability Analysis of Systems Using Single Valued Neutrosophic Sets" 한국지식정보기술학회 10 (10): 447-453, 2015
8 R. R. Yager, "Pythagorean fuzzy subsets" 57-61, 2013
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