The product and free product of fuzzy subgroups. Faculty of Education Scientific Journal, [S. l.], v. 3, n. 2, p. 392–381, 2024. DOI: 10.37375/foej.v3i2.2866. Disponível em: https://elc2.su.edu.ly/index.php/edujournal/article/view/2866. Acesso em: 22 jan. 2026.