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Sugarcane Bagasse Biochar as a Solid Catalyst: From Literature Review of Heterogeneous Catalysts for Esterifications to the Experiments for Biodiesel Synthesis from Palm Oil Industry Waste Residue. Indonesian J. Sci. Technol. 2023;6(2):337-352. Accessed September 27, 2025. https://ejournal.kjpupi.id/index.php/ijost/article/view/71