BATLLE, M. Presentación. OPERA, [S. l.], v. 17, n. 17, p. 1–2, 2015. DOI: 10.18601/16578651.n17.01. Disponível em: https://revistas.uexternado.edu.co/index.php/opera/article/view/4418. Acesso em: 5 dic. 2021.