Wedhasari, Tyas. “Linear Programming Approach of Biogas Production and Cost As an Independent Energy Source”. Jurnal Ilmiah Global Education 5, no. 4 (December 30, 2024): 3953–3962. Accessed February 5, 2025. https://ejournal.nusantaraglobal.or.id/index.php/jige/article/view/3672.