Qianqian Li and Shaoquan Sun, Intuitionistic Fuzzy Positive Implicative Ideals with Thresholds (λ,μ) of BCI-Algebras. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. November 2015, vol. 99(3). 201 - 205 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/10003203.