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| | - Inter-American Development Bank |
 | | Frankel, J., E. Stein and S. Wei, 1998, "Continental Trading Blocs: Are they Natural or Super-Natural?", in J. Frankel, ed., The Regionalization of the World Economy, University of Chicago Press. |
 | | Spilimbergo, A. and E. Stein, 1998, "Trading Blocs Among Countries with Different Endowments", in J. Frankel, ed., The Regionalization of the World Economy, University of Chicago Press. |
 | | Frankel, J., E. Stein and S. Wei, 1995, "Trading Blocs and the Americas: The Natural, the Unnatural and the Supernatural", Journal of Development Economics, June 1995, 47(1). |
| www.iadb.org /res/researcher.cfm?au_id=9 (1088 words) |
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