Randel et al. (2009)
Also: Randel 2009
An update of observed stratospheric temperature trends
Randel, W. J., Shine, K. P., Austin, J., Barnett, J., Claud, C., Gillett, N. P., ... & Yoden, S. (2009). An update of observed stratospheric temperature trends. Journal of Geophysical Research: Atmospheres (19842012), 114(D2). Link to PDF
DOI: 10.1029/2008JD010421
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.