ROJAS, Jorge. Geografía y Comercio / Geography and Trade. Economia, [S. l.], v. 18, n. 35-36, p. 273–276, 1995. DOI: 10.18800/economia.199501.008. Disponível em: https://revistas.pucp.edu.pe/index.php/economia/article/view/655. Acesso em: 28 dec. 2025.