L. K. Mangalla, R. R. Sisworo, B. Sudia, S. Samhuddin, and M. Simatupang, “Socialization and training on production of bio-charcoal made from biomass waste using a double-tube reactor”, ABDIMAS J. Pengabdi. Masy. Univ. Merdeka Malang, vol. 8, no. 1, pp. 1–12, Mar. 2023.