“A Doubt ₭ − Ǫ −Bipolar Fuzzy BCI-Ideals and Doubt ₭ − Ǫ −Bipolar Fuzzy BCI-Implicative Ideals in BCI-Algebra”. Journal of Pharmaceutical Negative Results, Sept. 2022, pp. 147-51, https://www.pnrjournal.com/index.php/home/article/view/440.