S. Sufia, T. . Santoso, S. . Aminah, and S. . Rahmawati, “Effectiveness of Purification Used Cooking Oil Using Adsorbents: Activated Charcoal Seeds Salak (Salacca zalacca) ”, J. Akademika Kimia, vol. 12, no. 4, pp. 247-253, Nov. 2023.