Saed, Ikram. “Symmetric Reverse Gamma *-4-Centralizers on Semiprime Gamma Rings With Involution”. Al-Qadisiyah Journal of Pure Science 26, no. 2 (April 15, 2021): Math. 77-. Accessed April 18, 2024. https://journalsc.qu.edu.iq/index.php/JOPS/article/view/1283.