Farafisha, H., 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”. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), vol. 14, no. 1, Jan. 2025, pp. 296-08, doi:10.23960/jtep-l.v14i1.296-308.