H. Farafisha, S. Herodian, A. T. Sugiarto, R. Anggarani, J. Pitoyo, and Y. Pramudito, “Analysis of Ultra Fine Bubble Addition on Biodiesel Fuel to Reduce Emission of Two Wheel Tractors Diesel Engine”, JTEP-L, vol. 14, no. 1, pp. 296–308, Jan. 2025.