Zhu, Bin, and Zeshui Xu. “Probability-Hesitant Fuzzy Sets and the Representation of Preference Relations”. Technological and Economic Development of Economy 24, no. 3 (May 18, 2018): 1029-1040. Accessed November 23, 2024. https://tede.vgtu.lt/index.php/TEDE/article/view/1680.