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Alan Heston, Robert Summers and Bettina Aten, Penn World Table Version 7.1Archivováno 22. 8. 2012 na Wayback Machine., Center for International Comparisons of Production, Income and Prices at the University of Pennsylvania, July 2012. Accessed on 19 August 2012. Note: GDP per capita data are "PPP Converted GDP Per Capita, average GEKS-CPDW, at current prices (in I$)", labeled as variable "cgdp2".
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