Hoai Linh, Nguyen, Ngo Kim Chi, Tran Le Minh, Dang Ngoc Phuong, Nguyen Xuan Tung, Do Thuy Tien, and Pham Thi Hong Minh. “Biochar of Post-Extraction Coffee Bean Ground As Materials for Ammonium Adsorption”. <i>Vietnam Journal of Science and Technology</i> 62, no. 2 (March 1, 2024): 324–334. Accessed March 19, 2026. https://cip.vast.vn/jst/article/view/17989.