Jing Liu,  Dependent Weighted Aggregation Operators of Hesitant Fuzzy Numbers.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 172 - 176
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/9997583.