LIAO, Kaili, Jijiang GE, Guicai ZHANG, and Lipei FU. “Multiple Frequency Ultrasounds Assisted Oil Sands Separation Technology”. Archives of Acoustics 42, no. 4 (November 13, 2017): 767–773. Accessed April 25, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1915.