Rocha Valencia, Alberto. “Geopolitics and Geo-Economics of the South American Community of Nations : Brazil the " Catalyst " and MERCOSUR a ‘center of Gravity ’”. Estudios Latinoamericanos (June 9, 2006): 177–202. Accessed July 17, 2024. https://revistas.unam.mx/index.php/rel/article/view/50216.