GAYEN, Sudipta; JHA, Sripati; SINGH, Manoranjan Kumar; PRASAD, Ashish Kumar. On anti-fuzzy subgroup. Yugoslav Journal of Operations Research, [S. l.], v. 31, n. 4, p. 539–546, 2021. DOI: 10.2298/YJOR200717043G. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/682. Acesso em: 28 jul. 2025.