EISSA, M. F. “A Study of the Effect of Etching Time on the Optical Properties of Irradiated CR-39 Polymer”. Walailak Journal of Science and Technology (WJST), vol. 11, no. 9, Dec. 2013, pp. 751-62, https://wjst.wu.ac.th/index.php/wjst/article/view/786.