Atiqe Ur Rahman, Muhammad Saeed, and Florentin Smarandache, “Convex and Concave Hypersoft Sets with Some Properties”, Neutrosophic Sets Syst., vol. 38, pp. 497–508, Dec. 2020, Accessed: Nov. 25, 2024. [Online]. Available: https://fs.unm.edu/nss8/index.php/111/article/view/4205