Muhammad Arshad, Atiqe Ur Rahman, Muhammad Saeed. An abstract approach to convex and concave sets under refined neutrosophic set environment. Neutrosophic Sets Syst. [Internet]. 2023 Jan. 1 [cited 2025 Apr. 11];53:274-96. Available from: https://fs.unm.edu/nss8/index.php/111/article/view/3227