Al- Dhahir, Tariq A., and Maryam E. Al-Mahdawi. 2022. “Dielectric and Optical Behaviors for Pure Potassium Sulfate and Doped With Copper and Iron”. Iraqi Journal of Science 57 (3A): 1699-1706. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/7032.