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Takaaki Fujita, Florentin Smarandache. A Concise Introduction to HyperFuzzy, HyperNeutrosophic, HyperPlithogenic, HyperSoft, and HyperRough Sets with Practical Examples. Neutrosophic Sets Syst. 2025;80:609-631. Accessed March 9, 2025. https://fs.unm.edu/nss8/index.php/111/article/view/5764