Yusuff, A.S., O.D. Adeniyi, M.A. Olutoye, and U.G. Akpan. “A Review on Application of Heterogeneous Catalyst in the Production of Biodiesel from Vegetable Oils”. Journal of Applied Science & Process Engineering 4, no. 2 (September 30, 2017): 142-157. Accessed March 28, 2024. https://publisher.unimas.my/ojs/index.php/JASPE/article/view/432.