Preambulo. CIENCIA UNEMI, [S. l.], v. 9, n. 17, p. 8, 2016. DOI: 10.29076/issn.2528-7737vol9iss17.2016pp8p. Disponível em: https://ojs.unemi.edu.ec/index.php/cienciaunemi/article/view/246. Acesso em: 9 may. 2025.