Hanjani Putri, et al. “Study of Methanol Concentration and Refining Temperature on the Characteristics of Methyl Ester Sulfonate from Waste Cooking Oil”. AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment), vol. 10, no. 3, July 2026, pp. 183-91, doi:10.29165/ajarcde.v10i3.1135.