Kurniawan, Ari, et al. “The Influence of Air Fuel Ratio on the Performances and Emissions of a SINJAI-150 Bioethanol Fueled Engines”. The International Journal of Mechanical Engineering and Sciences, vol. 2, no. 2, July 2025, pp. 16-22, doi:10.12962/j25807471.v2i2.6396 .