Kume, Honorio, and Guida Piani. “Mercosur: The Dilemma Between the Customs Union and a Free Trade Area”. Brazilian Journal of Political Economy 25, no. 4 (October 1, 2005): 370-390. Accessed May 5, 2024. https://centrodeeconomiapolitica.org.br/repojs/index.php/journal/article/view/648.