Abdulwahab, A. M., A. A. S. Qaidb, T. M. M. Ali, and A. S. Al-Sharabi. “Effect of Copper Doping on the Optical and Dielectric Parameters of Glycine Zinc Sulfate (GZS) Single Crystals”. University of Aden Journal of Natural and Applied Sciences, vol. 25, no. 2, Oct. 2021, pp. 315-30, doi:10.47372/uajnas.2021.n2.a09.