Abdulkareem, N., S. Sami, and B. Elias. “Structural, Electronic and Optical Properties of Cubic Perovskite Cspbx3 (X= Br, Cl and I)”. Science Journal of University of Zakho, Vol. 8, no. 1, Mar. 2020, pp. 23-28, doi:10.25271/sjuoz.2020.8.1.632.