Truong, Dai Quyet, Van Phu Pham, Le Minh Tran, and Tien Vinh Nguyen. “Utilizing Coffee Husk Biochar As an Effective Adsorbent for Ammonium Removal in Groundwater”. JST: Smart Systems and Devices 33, no. 5 (November 30, 2023): 26–33. Accessed July 2, 2025. https://jst.vn/index.php/ssad/article/view/6.