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