Cost, Emission, and Thermo-Physical Determination of Heterogeneous Biodiesel from Palm Kernel Shell Oil: Optimization of Tropical Egg Shell Catalyst. Indonesian J. Sci. Technol [Internet]. 2024 Jul. 19 [cited 2025 Sep. 6];9(1):1-32. Available from: https://ejournal.kjpupi.id/index.php/ijost/article/view/345