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. (2023). Indonesian Journal of Science and Technology, 6(2), 337-352. https://ejournal.kjpupi.id/index.php/ijost/article/view/71