Hang, Nga Nguyen Thi. “Removal of Suspended Clay Particles in Water by Weathered Volcanic Ash-Based Material”. American Scientific Research Journal for Engineering, Technology, and Sciences 35, no. 1 (August 26, 2017): 58–66. Accessed May 4, 2024. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/3262.