WASET
    Shaoquan Sun and  Qianqian Li,  Intuitionistic Fuzzy Subalgebras (Ideals) with Thresholds (λ, μ) of BCI-Algebras.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 86(2). 436 - 440
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/9997846.