Contrails, Cirrus Trends, and ClimateArkiverad 3 mars 2016 hämtat från the Wayback Machine. – joint paper by Patrick Minnis, Atmospheric Sciences, NASA Langley Research Center; J Kirk Ayers, Rabinda Palikonda and Dung Phan, Analytical Services and Materials
Contrails, Cirrus Trends, and ClimateArkiverad 3 mars 2016 hämtat från the Wayback Machine. – joint paper by Patrick Minnis, Atmospheric Sciences, NASA Langley Research Center; J Kirk Ayers, Rabinda Palikonda and Dung Phan, Analytical Services and Materials