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2. Renewable fuel standard: potential economic and environmental effects of U.S. biofuel policy,2011
3. On the promotion of the use of energy from renewable sources and amending and subsequently repealing directives 2001/77/EC and 2003/30/EC.2009.04.23;Off J EU,2009
4. Proposal for a directive of the European Parliament and of the council amending directive 98/70/EC relating to the quality of petro and diesel fuels and amending directive 2009/28/EC on the promotion of the use of energy from renewable sources,2012