EISSA, Moustfa Fawzy. “A Study of the Effect of Etching Time on the Optical Properties of Irradiated CR-39 Polymer”. Walailak Journal of Science and Technology (WJST) 11, no. 9 (December 23, 2013): 751–762. Accessed April 29, 2024. https://wjst.wu.ac.th/index.php/wjst/article/view/786.