“The Effect of Annealing on the Energy Gap of Polyimide (PI) and Polyethylene Terephthalate (PET) Polymers”. Iraqi Journal of Science 46, no. 1 (February 8, 2025): 141–144. Accessed February 8, 2025. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/15007.