RASULI, Rasul. Norms on intuitionistic fuzzy multigroups. Yugoslav Journal of Operations Research, [S. l.], v. 31, n. 3, p. 339–362, 2021. DOI: 10.2298/YJOR200318033R. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/671. Acesso em: 25 aug. 2025.