Hallosh Khidhir, Awad, and Amer Yahya Al-Jarjees. “Filler Content Effects on the Ultrasonic Response of Composite Materials Using the Pulse-Echo Amplitude Technique”. Journal of Engineering and Sustainable Development 11, no. 1 (March 1, 2007): 29–44. Accessed February 19, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1700.