Mohammed, M. B., M. J. . Subhi, and . A. A. W. Jamsari. “New Approaches in Frequency Table Construction for Continuous Symmetrical Data”. MATEMATIKA: Malaysian Journal of Industrial and Applied Mathematics, vol. 38, no. 3, Dec. 2022, pp. 181-93, https://matematika.utm.my/index.php/matematika/article/view/1415.