Abdulkareem, Nawzad, Sarkawt Sami, and Badal Elias. “Structural, Electronic and Optical Properties of Cubic Perovskite Cspbx3 (X= Br, Cl and I)”. Science Journal of University of Zakho 8, no. 1 (March 30, 2020): 23-28. Accessed May 26, 2020. https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/632.