“ Corncob-Derived Sulfonated Magnetic Solid Catalyst Synthesis as Heterogeneous Catalyst in The Esterification of Waste Cooking Oil and Bibliometric Analysis” (2024) Indonesian Journal of Science and Technology, 9(1), pp. 109–124. Available at: https://ejournal.kjpupi.id/index.php/ijost/article/view/349 (Accessed: 6 September 2025).