Marchenko, A., and M. Mishchenko. “Improving Efficiency Indicators and Reducing CO2 Emissions by Using Hydrogen and Methane Additives to Gasoline in a Spark-Ignition Engine”. Eastern-European Journal of Enterprise Technologies, vol. 2, no. 1 (140), Apr. 2026, pp. 66-77, doi:10.15587/1729-4061.2026.356685.