A. Yousef, Yaser, Khalid E. Al-Ani, and Talal Akasheh. 2010. “Effect of Solvent on Fluorescence and Fluorescence Lifetimes of P-Substituted Polystyrene”. Asian Journal of Chemistry 18 (3):1675-84. https://asianpubs.org/index.php/ajchem/article/view/20855.