Ginting, E., Ginting, A., Simatupang, L., Sembiring, J. and Ginting, V. 2026. Biodiesel Conversion from Used Cooking Oil: An Eggshell-Based ZnO/CaO Supported on Activated Carbon Catalyst with Microwave Heating. Jurnal Kartika Kimia. 8, 2 (Apr. 2026), 264-271. DOI:https://doi.org/10.26874/jkk.v8i2.994.