“A Doubt ₭ − Ǫ −Bipolar Fuzzy BCI-Ideals and Doubt ₭ − Ǫ −Bipolar Fuzzy BCI-Implicative Ideals in BCI-Algebra” (2022) Journal of Pharmaceutical Negative Results, pp. 147–151. Available at: https://pnrjournal.com/index.php/home/article/view/440 (Accessed: 5 June 2026).