D. MAHMOOD, R. PILP-rings and fuzzy ideals. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 6, n. 2, p. 31–37, 2009. DOI: 10.33899/csmj.2009.163794 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36401. Acesso em: 18 dec. 2025.