Johnson Awolola, “ A Note on the Concept of α-Level Sets of Neutrosophic Set”, Neutrosophic Sets Syst., vol. 31, no. 2020-07, pp. 120–126, Jul. 2020, Accessed: Jul. 02, 2025. [Online]. Available: https://fs.unm.edu/nss8/index.php/111/article/view/436