Agustikawati N, Nugrahani R, Setianingsih F. Reducing free fatty acids and peroxide value in used cooking oil using activated coconut shell charcoal combined with lemongrass stems. J. Pijar.MIPA [Internet]. 2023 Sep. 30 [cited 2024 Jul. 22];18(5):809-15. Available from: https://jurnalfkip.unram.ac.id/index.php/JPM/article/view/5586