Butchart, N., Charlton-Perez, A. J., Cionni, I., Hardiman, S. C., Haynes, P. H., Krüger, K., et al. (2011). Multimodel climate and variability of the stratosphere. Journal of Geophysical Research-Atmospheres, 116: D05102. doi:10.1029/2010JD014995.