WASET
    M.M. Zahedi and  L. Torkzadeh,  Intuitionistic Fuzzy Dual Positive Implicative Hyper K- Ideals.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2007, vol. 5(5). 251 - 254
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/15110.