Preámbulo. CIENCIA UNEMI, [S. l.], v. 9, n. 21, p. 8, 2017. DOI: 10.29076/issn.2528-7737vol9iss21.2016pp8p. Disponível em: https://ojs.unemi.edu.ec/index.php/cienciaunemi/article/view/414. Acesso em: 30 jul. 2025.