T.-T. Do, T.-H. Nguyen, T.-D. Nguyen, and H.-T. Van, “The ammonium adsorption capacity of coffee husk‑derived activated carbon composite with \(\text{MnFe}_2\text{O}_4\)”, HPU2. Nat. Sci. Tech, vol. 4, no. 01, pp. 39–47, Apr. 2025.