NAMA, N. M. On Fuzzy Internal Direct Product. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 23, n. 3, p. 238–245, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/905. Acesso em: 29 mar. 2025.