Study on extracting the metals Fe, Ni, V and Ca in residue after atmosphere distillation from the acid citric solution/ iso-propyl alcohol solvent and gasoline. Vietnam Journal of Catalysis and Adsorption, [S. l.], v. 7, n. 4, p. 69–75, 2018. Disponível em: https://jca.edu.vn/index.php/jca/article/view/620.. Acesso em: 9 may. 2025.