Sasongko, Mega Nur, and Widya Wijayanti. “Experiment Investigation on the Effect of Oxygen Percentage on Combustion Characteristics of Waste Cooking Oil Biodiesel”. International Journal of Integrated Engineering 13, no. 1 (January 7, 2021): 39–45. Accessed May 13, 2024. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/5554.