Septiana, Liska Mutiara, et al. “Characteristics of Biochars from Plant Biomass Wastes at Low-Temperature Pyrolysis”. SAINS TANAH - Journal of Soil Science and Agroclimatology, vol. 15, no. 1, July 2018, pp. 15-28, https://doi.org/10.15608/stjssa.v15i1.21618.