“Influence of Gamma Radiation on Some Optical Properties and Urbach Energy of (PMMA- Doped Red Methyl) Films”. Ibn AL-Haitham Journal For Pure and Applied Sciences 26, no. 3 (April 24, 2017): 219–224. Accessed May 6, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/430.