Zemriyetti, S. Mayly, Refnizuida, R. . Girsang, and B. . Hidayat, “Characterization Biochar Properties from Waste of Cassava, Sugarcane, and Coconut”, jeas, vol. 3, no. 1, pp. 37–41, Mar. 2022, doi: 10.32996/jeas.2022.3.1.4.