Riyanto, C. A., M. S. Ampri, and Y. Martono. “Synthesis and Characterization of Nano Activated Carbon from Annatto Peels (Bixa Orellana L.) Viewed from Temperature Activation and Impregnation Ratio of H3PO4”. EKSAKTA: Journal of Sciences and Data Analysis, vol. 20, no. 1, Feb. 2020, pp. 44-50, doi:10.20885/EKSAKTA.vol1.iss1.art7.