Lestari, Rianti Indah. “Supply Chain Design of Used-Cooking Oil for Biofuel: A Case Study in Special Region of Yogyakarta”. Journal of Industrial Engineering and Education 1, no. 1 (March 19, 2023): 107–118. Accessed May 6, 2026. https://jiee.bksti.org/index.php/iee/article/view/12.