Yassin Shehab, Ahmed. “Effect of Ultrasonic Waves on Sedimentation Characteristics and Sludge Dewaterability”. Al-Rafidain Engineering Journal (AREJ) 19, no. 6 (December 28, 2011): 30–39. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/arej/article/view/31173.