HATEM AHMAD, S. On Rings Whose Principal Ideals are Pure. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 3, n. 2, p. 53–57, 2006. DOI: 10.33899/csmj.2006.164051 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36388. Acesso em: 17 dec. 2025.