Santoso, A.; Ramadhan, L.; Susilo, B.; Sukarni, S.; Wijaya, A.; Sumari, S.; Muntholib, M.; Pramesti, I. N.; Asrori, M. R. Conversion of Waste Cooking Oil With Transesterification Process in Ultrasonicator Using SrO-KF Catalyst. Orbital: Electron. J. Chem. 2024, 16, 136-142.