Ullah, Kifayat, T. Mahmood, N. Jan, S. Broumi, and Q. Khan. “On Bipolar-Valued Hesitant Fuzzy Sets and Their Applications in Multi-Attribute Decision Making”. The Nucleus 55, no. 2 (October 12, 2018): 93–101. Accessed November 22, 2024. http://thenucleuspak.org.pk/index.php/Nucleus/article/view/417.