Hamada, Khalaf Ibrahim, et al. “Throttling Effect on the Performance and Emissions of a Multi-Cylinder Gasoline Fuelled Spark Ignition Engine”. International Journal of Automotive and Mechanical Engineering, vol. 19, no. 4, Dec. 2022, pp. 10084-93, https://doi.org/10.15282/ijame.19.4.2022.05.0779.