Tuan, Le Ngoc, and Phạm Ngọc Châu. “An Executive Review of Sludge Pretreatment Techniques”. <i>Vietnam Journal of Science and Technology</i> 52, no. 1 (March 19, 2014): 1–34. Accessed March 2, 2026. https://vjs.ac.vn/jst/article/view/2962.