Sangodapo, Taiwo. “Some Notions on Convexity of Picture Fuzzy Sets: Convexity of Picture Fuzzy Sets”. Journal of the Nigerian Mathematical Society 41, no. 2 (October 5, 2022): 83–103. Accessed May 4, 2024. https://ojs.ictp.it/jnms/index.php/jnms/article/view/863.