محمد حمید أ, كاطع دواي ا. Study the Mechanical Behavior for Unsaturated Polyester Resin and Polystyrene. J. eng. sustain. dev. 2014;18(5):Ar 1-12. Accessed May 13, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/943