Rashid, Abdul-Kareem J, and Burak Y Kadem. “Effect of Variable Ultrasonic Frequencies on Some Physical Properties of Iraqi Palm Fiber PVA Composite”. Journal of Asian Scientific Research 1, no. 7 (November 15, 2011): 359–365. Accessed July 3, 2024. https://archive.aessweb.com/index.php/5003/article/view/3307.