SMARANDACHE, Florentin. Extension of Soft Set to Hypersoft Set, and then to Plithogenic Hypersoft Set. Neutrosophic Sets and Systems, [S. l.], v. 22, p. 168–170, 2018. Disponível em: https://fs.unm.edu/nss8/index.php/111/article/view/280.. Acesso em: 2 jun. 2025.