“ The Properties of Fuel and Characterization of Functional Groups in Biodiesel -Water Emulsions from Waste Cooking Oil and Its Blends”. Indonesian Journal of Science and Technology 5, no. 1 (January 11, 2024): 95–108. Accessed July 9, 2025. https://ejournal.kjpupi.id/index.php/ijost/article/view/114.