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United Nations Development Programme (UNDP). 2006. Human Development Report 2006. Table 21. New York: Oxford University Press. Johnson, Francis X. and Rosillo-Calle, F. 2007. Biomass, Livelihoods and International Trade: Challenges and Opportunities for the EU and Southern Africa. Table 3. http://www.sei.se/index.php?page=pubs&pubaction=showitem&item=718 (Accessed May 1, 2008)