Tawfiq, E.A. and Kamil, G.M. (2019) “Modification of Spectral Properties of Polystyrene / Diethyl phthalate in Different Solutions”, Iraqi Journal of Science, 60(4), pp. 762–768. Available at: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/755 (Accessed: 5 January 2026).