Muadifah A, Santoso A, Ngibad K, Martha RD, Kholifah SN. Calcium Reduction Using Variations of Thickness and Retention Time of Cocoa Shell Activated Carbon. chempublish [Internet]. 2023Jul.30 [cited 2024Jul.5];7(1):42-53. Available from: https://online-journal.unja.ac.id/chp/article/view/24768