Prihatno, Anton, and Andi Hendrawan. “Performance of Spark-Ignition Engine at Various Fuel Octane Numbers”. Applied Research and Smart Technology (ARSTech) 2, no. 1 (July 15, 2022): 34–40. Accessed May 17, 2024. https://journals2.ums.ac.id/index.php/arstech/article/view/149.