K. JABBAR, A.; H. MAJEED, A. On Centrally Prime and Centrally Semiprime Rings. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 5, n. 1, p. 47–56, 2008. DOI: 10.33899/csmj.2008.163948 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/37097. Acesso em: 17 dec. 2025.