Karl et al. (2006)
Also: Karl et al. 2006
Temperature Trends in the Lower Atmosphere: Steps for Understanding and Reconciling Differences
Karl, T., Hassol, S., Miller, C., & Murray, W. (2006). Temperature Trends in the Lower Atmosphere: Steps for Understanding and Reconciling Differences. A Report by the Climate Change Science Program and the Subcommittee on Global Change Research, Washington, DC. Link to report
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.