Muadifah, A. ., Santoso, A., Ngibad, K., Martha, R. D. and Kholifah, S. N. (2023) “Calcium Reduction Using Variations of Thickness and Retention Time of Cocoa Shell Activated Carbon”, Chempublish Journal, 7(1), pp. 42-53. doi: 10.22437/chp.v7i1.24768.