Z. Helwani, I. Zahrina, S. Z. Amraini, R. Idroes, G. F. Neonufa, and S. A. Rahman, “Improving the Environmental Performance of Palm Biodiesel via AgNO₃-Assisted Removal of Polyunsaturated Fatty Acids”, Leuser J. Environ. Stud., vol. 3, no. 1, pp. 36–43, Apr. 2025.