B. A. Sinaga, D. S. Saragi, M. F. V. Pane, and F. Darma, “Increasing The Efficiency Of Plate Heat Exchanger (PHE) Economizer And Cooler Towards The Reduction Of Sterol Glucoside Components As Total Contaminants In Biodiesel”, ijim, vol. 3, no. 1, pp. 549–559, Mar. 2025.