1. Airports Council International, 2012. http://en.wikipedia.org/wiki/World's_busies t_airports_ by_international_passenger _traffic.
2. Global radiative forcing from contrail cirrus;Burkhardt;Nature Climate Change,2011
3. Jet contrails and cirrus cloud: a feasibility study employing high-resolution satellite imagery;Carleton;Bulletin of the American Meteorological Society,1986
4. European Environment Agency (EEA), 2009. EMEP/EEA Air Pollutant Emission Inventory Guide Book – 2009.
5. Emissions of HC, NOx, CO2, and SO2 from civil aviation in China in 2010;Fan;Atmospheric Environment,2012