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2. Advisory Council for Aeronautical Research in Europe (ACARE), European Aeronautics: a Vision for 2020, 2001.
3. European Commission, Flightpath 2050 Europe's Vision for Aviation-Report of the High Level Group on Aviation Research, Luxembourg, 2011.
4. International Air Transport Association (IATA), A Global Approach to Reducing Aviation Emissions, 2009.
5. Air Transport Action Group (ATAG), A Sustainable Flightpath Towards Reducing Emissions, 2012.