Pitaloka, D. A., Santoso, A. and Hayuningtyas, I. F. (2025) “Trenggalek Durian Peel Ash a K2O Catalyst in Ultrasonic Biodiesel Production”, Journal of The Indonesian Society of Integrated Chemistry, 17(2), pp. 83–91. doi: 10.22437/jisic.v17i2.49504.