R. A. . Narantoko, A. . Riza, and H. . Tanujaya, “Analysis of Dual Combustion of Natural Gas and Biodiesel Fuels in a Single Cylinder Diesel Engine: Thermal Efficiency and Performance Study”, IRA J.Tek. Mesin Dan Apl, vol. 4, no. 2, pp. 17–25, Aug. 2025.