Corncob-Derived Sulfonated Magnetic Solid Catalyst Synthesis as Heterogeneous Catalyst in The Esterification of Waste Cooking Oil and Bibliometric Analysis. Indonesian J. Sci. Technol. 2024;9(1):109-124. Accessed September 6, 2025. https://ejournal.kjpupi.id/index.php/ijost/article/view/349