Sudarmadji, S., S. Santoso, and S. H. Susilo. “Analysis of the Effect of Ultrasonic Vibration on Nanofluid As Coolant in Engine Radiator”. Eastern-European Journal of Enterprise Technologies, vol. 5, no. 5 (113), Oct. 2021, pp. 6-13, doi:10.15587/1729-4061.2021.241694.