LIN, Robert. Note on fuzzy sets. Yugoslav Journal of Operations Research, [S. l.], v. 24, n. 2, p. 299–303, 2014. DOI: 10.2298/YJOR130202010L. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/398. Acesso em: 26 aug. 2025.