Preambulo. CIENCIA UNEMI, [S. l.], v. 9, n. 20, p. 8, 2016. DOI: 10.29076/issn.2528-7737vol9iss20.2016pp8p. Disponível em: https://ojs.unemi.edu.ec/index.php/cienciaunemi/article/view/341. Acesso em: 31 may. 2025.