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