Abdulwahab, A. M.; Qaidb, A. A. S.; Ali, T. M. M.; Al-Sharabi, A. S. Effect of Copper Doping on the Optical and Dielectric Parameters of Glycine Zinc Sulfate (GZS) Single Crystals. Univ. Aden J. Nat. and Appl. Sc. 2021, 25, 315-330.