José M. Merigó and  Montserrat Casanovas,  Using Fuzzy Numbers in Heavy Aggregation Operators.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2008, vol. 24(12). 4114 - 4119
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/4196.