Agustikawati, N., Nugrahani, R. ., & Setianingsih, F. . (2023). Reducing free fatty acids and peroxide value in used cooking oil using activated coconut shell charcoal combined with lemongrass stems. Jurnal Pijar Mipa, 18(5), 809–815. https://doi.org/10.29303/jpm.v18i5.5586