Calcium Oxide Derived from Okpella Limestone as a Heterogeneous Catalyst for Biodiesel Production: Synthesis, Characterisation and Stability Assessment. FUDMA Journal of Engineering and Technology, [S. l.], v. 1, n. 2, p. 863–875, 2025. DOI: 10.33003/bne6wb50. Disponível em: https://fjet.fudutsinma.edu.ng/index.php/fjet/article/view/102. Acesso em: 14 mar. 2026.