“The Effect of PVC Powder content on the Elastic Moduli and Acoustic Impedance of Epoxy Composites”, IJP, vol. 7, no. 8, pp. 43–48, Dec. 2009, Accessed: May 11, 2024. [Online]. Available: https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/913