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2. Der Emissionsrechner;Atmosfair,2005
3. The Inconvenient Truth about the Carbon Offset Industry;Davies,2007
4. Moving targets: strategic trends in the aviation sector;Delfmann,2005
5. Proposal for a Directive of the European Parliament and the Council Amending Directive 2003/87/EC as to Include Aviation Activities in the Scheme for Greenhouse Gas Emission Allowance Trading within the Community;European Commission,2006