Nurhakimah Ab. Rahman and  Lazim Abdullah,  An Interval Type-2 Dual Fuzzy Polynomial Equations and Ranking Method of Fuzzy Numbers.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 92 - 99
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/9997320.