“Determination of Effectiveness Absorption of The Rice Husk And Hazelnut Shell to Purification Used Cooking Oil”. Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) 12, no. 1 (May 30, 2019): 19–28. Accessed August 19, 2026. https://journal-598.unhas.ac.id/index.php/ica/article/view/6172.