Cole, Julio. World Economic Growth, 1980–1999: A Growth-Regression Approach. p. 9. September 2003. "Tesis Doctoral". Archived from the original on 2008-07-08. Retrieved 2008-07-05.
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Cole, Julio. World Economic Growth, 1980–1999: A Growth-Regression Approach. p. 9. September 2003. "Tesis Doctoral". Archived from the original on 2008-07-08. Retrieved 2008-07-05.