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Naeem, M. M., Al-Sakkari, E. G., Boffito, D. C., Rene, E. R., Gadalla, M. A., & Ashour, F. H. (2023). Single-stage waste oil conversion into biodiesel via sonication over bio-based bifunctional catalyst: Optimization, preliminary techno-economic and environmental analysis. Fuel, 341, 127587 (13 pages). External link