Botahala L, Malailak Y, Silvia Maure H, Karlani H. Determination of Effectiveness Absorption of The Rice Husk And Hazelnut Shell to Purification Used Cooking Oil. ICA [Internet]. 2019May30 [cited 2024May3];12(1):19-28. Available from: https://journal.unhas.ac.id/index.php/ica/article/view/6172