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2. On the possibility of weather modification by aircraft contrails;Murcray;Mon. Wea. Rev.,1970
3. IPCC, Aviation and the Global Atmosphere. A Special Report of IPCC (Intergovernmental Panel on Climate Change),1999
4. Aviation-produced aerosols and cloudiness;Fahey,1999
5. Aviation-produced aerosols and contrails;Kärcher;Surveys Geophys.,1999