WASET
    B. Farhadinia,  Ranking Fuzzy Numbers Based on Lexicographical Ordering.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2009, vol. 33(9). 747 - 750
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/5683.