ETERIGHO, E. J.; FARROW, T. S.; OGBUKA, C. P. Effect of Modification on Conventional Preparation Method for Sulphated Zirconia on the Production of Fatty Acid Methyl Ester. Asian Journal of Engineering and Technology, [S. l.], v. 2, n. 3, 2014. Disponível em: https://www.ajouronline.com/index.php/AJET/article/view/1398. Acesso em: 8 dec. 2021.