“Development of Heterogeneous Catalyst from Waste Cow Bone Using Parinarium Macrophylum Seed Oil for Biodiesel Production”, Commun. Phys. Sci, vol. 7, no. 3, pp. 203–217, Jul. 2021, Accessed: Jul. 21, 2026. [Online]. Available: https://journalcps.com/index.php/volumes/article/view/504