Mondamina, Novelita Wahyu, Deni Rachmat, and Mochammad Waris Tegar Laksono. “Alternative Scenarios to Utilise Excess Biogas in Palm Oil Mill”. Indonesian Journal of Environmental Management and Sustainability 4, no. 2 (June 30, 2020): 48-54. Accessed August 8, 2020. http://ijoems.com/index.php/ijems/article/view/114.