Surahmanto, F., D. Nurhadiyanto, Mujiyono, C. Areeprasert, and M. Syamsiro. “Hydrothermal Treatment of Herb Residue for Solid Fuel Production”. ASEAN Journal of Chemical Engineering, Vol. 21, no. 1, June 2021, pp. 83-92, https://jurnal.ugm.ac.id/v3/AJChE/article/view/9155.