这页说点犹豫模糊集。在“区间值犹豫模糊集”一文说：Krassimir Atanassov在1986年提出的直觉模糊集，同时考虑隶属度、非隶属度和犹豫度（我以前在这页第10节也说过这领域）。其后Vicenç
Torra于2010年提出犹豫模糊集 (
Hesitant fuzzy sets)的概念（确实Vicenç Torra在开创性的最先2篇2009年的会议论文以及2010年在IJIS的论文就已明说其和Krassimir Atanassov的直觉模糊集有诸多关系）。下面再附几篇这领域最近较受关注的论文：
Vicenç
Torra，Y.
Narukawa，On hesitant fuzzy sets and
decision，2009 IEEE International
Conference on Fuzzy Systems；（T和N在这2009年的会议上最先提出这概念，并在提出第5年的2014年美国爱欧纳学院Ronald
R. Yager就在他主编的这IJIS杂志出这领域的专集）。
Vicenç
Torra，Hesitant fuzzy
sets. International Journal of Intelligent Systems.2010,25(6),529-539；（看不到投稿日期是否应比2009年早，如此才只说Torra一人。当然，也有人只以正式出版或接受时为准）
徐泽水，夏梅梅，Distance
and similarity
measures for hesitant fuzzy sets. Information Sciences, 2011, 181(11):
2128-2138；
夏梅梅，徐泽水，Hesitant
fuzzy information aggregation in decision making. International Journal of
Approximate Reasoning, 2011, 52(3): 395-407；
朱斌，徐泽水，夏梅梅，Hesitant
fuzzy geometric Bonferroni means. Information Sciences, 2012, 205(1): 72-85.
陈娜，徐泽水，夏梅梅，Correlation
coefficients of
hesitant fuzzy sets and their applications to clustering analysis. Applied
Mathematical Modelling, 2013, 37(4): 2197-2211.
廖虎昌，徐泽水，Xiao-Jun
Zeng, Distance and similarity
measures for hesitant fuzzy linguistic term sets and their application in
multi-criteria decision making, Information Sciences, 2014, vol. 271, pp.
125-142；
Rosa
Ma Rodríguez, Luis Martínez，Vicenç Torra，徐泽水，Francisco
Herrera，Hesitant
Fuzzy Sets: State of the Art and Future Directions，International
Journal of Intelligent Systems, 2014, 29(6): 495-524；
伊朗学者Bahram
Farhadinia，Information
measures for hesitant
fuzzy sets and interval-valued hesitant fuzzy sets，Information
Sciences，Volume
240, 10 August 2013, Pages 129-144；他是我国《智能技术学报》编委-Bahram
Farhadinia
Bahram
Farhadinia， Hesitant
fuzzy set lexicographical ordering and its application to multi-attribute
decision making. Inform. Sci.327 (2016), 233--245.
Bahram
Farhadinia，Multiple
criteria decision-making methods with completely unknown weights in hesitant
fuzzy linguistic term setting，Knowledge-Based
Systems Volume 93, 1 February 2016, Pages 135-144；
R.M. Rodríguez, B. Bedregal, H. Bustince, Y.C.
Dong, B. Farhadinia, C. Kahraman, L. Martínez, V. Torra, Y. Xu, Z.S. Xu, F.
Herrera. A position and perspective analysis of
hesitant fuzzy sets on information fusion in decision making: Towards high
quality progress. Information Fusion, 2016, 29: 89-97；