ONWUMA N.C AND OKIEMEN C.O. Optimum biodiesel production from waste vegetable oil using functionalized cockle shell and watermelon peels as catalyst. Journal of Energy Technology and Environment, [S. l.], v. 6, n. 2, p. 88–103, 2024. DOI: 10.5281/zenodo.11408539. Disponível em: https://journals.nipes.org/index.php/jete/article/view/883. Acesso em: 22 dec. 2024.