H.Majeed, Abdul Rahman, and Rajaa C.Shaheen. “Jordan Left Derivation and Jordan Left Centralizer of Skew Matrix Rings”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 7, no. 2, Aug. 2017, pp. 36-45, https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/62.