“OPTIMIZATION OF DEVELOPMENT PERFORMANCEANDQUALITY IMPROVEMENT OF BIODIESEL FROM OIL FRACTIONOF LIQUID WASTE OF PALM OIL PROCESS BY USING ULTRASONIC WAVES” (2012) Jurnal Teknologi Industri Pertanian, 22(1). Available at: https://journal.ipb.ac.id/jurnaltin/article/view/5591 (Accessed: 29 December 2025).