“ Cost, Emission, and Thermo-Physical Determination of Heterogeneous Biodiesel from Palm Kernel Shell Oil: Optimization of Tropical Egg Shell Catalyst” (2024) Indonesian Journal of Science and Technology, 9(1), pp. 1–32. Available at: https://ejournal.kjpupi.id/index.php/ijost/article/view/345 (Accessed: 6 September 2025).