Gala, D. S., Rahmanpiu, R. and Mulyana, W. O. (2025) “Application of Silica Adsorbent Rice Husk Ash-Activated Carbon in Refining Waste Cooking Oil”, Hydrogen: Jurnal Kependidikan Kimia, 13(1), pp. 197–208. doi: 10.33394/hjkk.v13i1.14802.