T. . Nachaithong, P. . Sikam, P. . Moontragoon, P. . Thongbai, T. . Kaewmaraya, and Z. . Ikonic, “The study of optical and colossal dielectric properties of (Cu, Ga)-doped ZnO nanoparticles”, Eng Appl Sci Res, vol. 48, no. 6, pp. 759–765, Jul. 2021.