Hussein, Ahmed Shaker, Mohammed Hadi Shinen, and Mohammed Sami Abdali. “Study the Effect of Thickness on Optical Properties of Polymer PMMA Thin Films Preparated by Spin Coating Method”. JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences 27, no. 4 (August 25, 2019): 169 - 177. Accessed December 13, 2019. https://www.journalofbabylon.com/index.php/JUBPAS/article/view/2459.