Preambulo. CIENCIA UNEMI, [S. l.], v. 6, n. 9, p. 6, 2015. DOI: 10.29076/issn.2528-7737vol6iss9.2013pp6p. Disponível em: https://ojs.unemi.edu.ec/index.php/cienciaunemi/article/view/54. Acesso em: 9 may. 2025.