Jensen, E. J., Toon, O. B., Vay, S. A., Ovarlez, J., May, R., Bui, T. P., … Schumann, U. (2001). Prevalence of ice-supersaturated regions in the upper troposphere: Implications for optically thin ice cloud formation. Journal Of Geophysical Research-Atmospheres, 106, 17253-17266. doi:10.1029/2000JD900526