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. Indones. j. sci. technol. 2021, 6 (2), 337-352. https://doi.org/10.17509/ijost.v6i2.34498.