Suman Das, Rakhal Das, and Surapati Pramanik, “Topology on Ultra Neutrosophic Set”, Neutrosophic Sets Syst., vol. 47, pp. 93–104, Dec. 2021, Accessed: May 10, 2026. [Online]. Available: https://fs.unm.edu/nss8/index.php/111/article/view/4126