“Two-Stage Palm Kernel Shell Washing With Water and Acetic Acid As Preparation of Co-Firing System With Coal”. Rudarsko-geološko-naftni zbornik 39, no. 1 (March 1, 2024): 1–10. Accessed August 19, 2025. https://ojs.srce.hr/index.php/rgn/article/view/28180.