Al-Daeif, Y., E. Yousif, and M. A. Nabi. “Synthesis of New Polymers Derived from Poly (Vinyl Chloride) and Study Their Optical Properties”. Al-Nahrain Journal of Science, Vol. 15, no. 2, June 2012, pp. 79-83, https://anjs.edu.iq/index.php/anjs/article/view/1066.