Datti, Suleiman. “An α-Cut-Based Ranking Index for Normal Trapezoidal Fuzzy Numbers”. FUDMA Journal of Sciences 10, no. 21 (October 28, 2026): 124–129. Accessed October 31, 2026. https://fjs.fudutsinma.org.ng/index.php/fjs/article/view/6263.