AHMED, Ibrahim S; EBRAHIM, Hassan H.; AL-FAYADH, Ali. Study of Fuzzy σ-Ring  and Some Related Concepts. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 35, n. 2, p. 37–46, 2022. DOI: 10.30526/35.2.2767. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/2767. Acesso em: 29 mar. 2025.