J Mohammad, Ali, and Mudhar Abbas Majeed. “On Simultaneous Approximation for a Generalization of Baskakov–Beta Operators”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 1, no. 1, Aug. 2017, pp. 184-93, https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/182.