Sudarma, Andi Firdaus, Edy Hartulistiyoso, Yohanes Aris Purwanto, Leopold Oscar Nelwan, Obie Farobie, Nono Darsono, Khuzaimah Arifin, et al. 2026. “Influence of Inorganic Content on Hydrochar Quality from High-Ash Agar Extraction Waste via Hydrothermal Carbonization”. SINERGI 30 (3). Jakarta, Indonesia:731-46. https://doi.org/10.22441/sinergi.2026.3.005.