Fatima Garba Yusuf, Fatima Abubakar Muhammad and Abubakar Abubakar Ibrahim. “Transesterification of Soybean Acid Oil With Al2O3 Catalyst: Effects of Catalyst Concentration and Reaction Time on Biodiesel Yield and Quality”. Journal of Energy Technology and Environment, vol. 7, no. 1, Mar. 2025, pp. 1-13, doi:10.5281/zenodo.15007489.