Florentin Smarandache, “Ambiguous Set is a subclass of the Double Refined Indeterminacy Neutrosophic Set, and of the Refined Neutrosophic Set in general”, Neutrosophic Sets Syst., vol. 58, pp. 639–643, Dec. 2023, Accessed: Nov. 22, 2024. [Online]. Available: https://fs.unm.edu/nss8/index.php/111/article/view/3568