Ag ministry (see pages 78-79)
http://www.agricultura.gov.br/pls/portal/docs/PAGE/MAPA/PLANOS/PNA_2006_2011/PLANO%20NACIONAL%20DE%20AGROENERGIA%202006%20-%202011-%20INGLES_1_0.PDF
IEA (pg. 167)
http://www.iea.org/textbase/nppdf/free/2004/biofuels2004.pdf
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