Al-Husban, Abdallah, Ala Amourah, and Jamil J. Jaber. “Bipolar Complex Fuzzy Sets and Their Properties”. Italian Journal of Pure and Applied Mathematics 43 (February 14, 2020): 754–761. Accessed November 6, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/7293.