1.
Ortiz-Mena L. N. A. Jeffrey A. Frankel, Regional Trading Blocs in the World Economie System, Washington, D. C., Institute for International Economies, 1997, 364 p. PyG [Internet]. 1999 Apr. 20 [cited 2026 Oct. 13];6(2):543-6. Available from: http://www.politicaygobierno.cide.edu/index.php/pyg/article/view/457