Azzahro UL, Broto W. Utilization of Waste Shells as CaO Catalyst in Biodiesel Production from Used Cooking Oil . Acta.Chim.Asiana [Internet]. 2022 Apr. 17 [cited 2024 Dec. 22];5(1):147-52. Available from: https://aca.unram.ac.id/index.php/ACA/article/view/69