Adiwibowo, Indradarma, et al. “Enhancing Energy Security through Utilization of Local Resources: Case Study: Biomass Biogas Utilization in Berau Regency, East Kalimantan”. Indonesian Journal of Energy, vol. 1, no. 1, Feb. 2018, pp. 22-34, doi:10.33116/ije.v1i1.11.