Prasetyo, Teguh Budi, Amsar Maulana, Mimien Harianti, Aresta Leo Lita, and Herviyanti. “Modification of Surface Charges on Ex-Gold Mining Soil Ameliorated With Activation of Sub-Bituminous Coal - NaOH”. International Journal on Advanced Science, Engineering and Information Technology 13, no. 5 (October 31, 2023): 1772–1780. Accessed July 3, 2024. https://ijaseit.insightsociety.org/index.php/ijaseit/article/view/18429.