Winoko, Yuniarto Agus, and Jefri Haris Sudarmanto. “The Effect of Number of Spark Plug Ground Electrodes and Octane Rating on Single Cylinder Engine Performance”. International Journal of Marine Engineering Innovation and Research 9, no. 3 (July 10, 2025): 512–519. Accessed January 28, 2026. https://journal.its.ac.id/index.php/ijmeir/article/view/4912.