Mousa, G. H., and A. Mohammad Husain. “Right Closed Multiplication Sets in Prime Near-Ring -Derivation”. Journal of Al-Qadisiyah for Computer Science and Mathematics, Vol. 3, no. 1, Sept. 2017, pp. 20-27, https://qu.edu.iq/journalcm/index.php/journalcm/article/view/236.