“Nonlinear Trade-Off Between Agitator Speed and Biodiesel Quality in Transesterification: A Lab-Scale Study”. ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK 16, no. 1 (May 6, 2026): 73–87. Accessed May 10, 2026. https://e-journal.upm.ac.id/index.php/energy/article/view/energy.v16i1.1615.