D. I. M. Putri, S. Sumari, H. Darmokoesomo, G. Supriyanto, and N. A. Nugroho, “Conversion of Glycerol to Ethanol by Integrating Ultrasonic and Ni/ZSM-5 Catalyst”, Eksergi, vol. 20, no. 1, pp. 1–7, Mar. 2023.