Thompson et al. (2008)
Also: Thompson et al. 2008
A large discontinuity in the mid-twentieth century in observed global-mean surface temperature
Thompson, D.W., Kennedy, J.J., Wallace, J.M. & Jones, P.D. (2008). A large discontinuity in the mid-twentieth century in observed global-mean surface temperature. Nature. 453(7195),646-649. Article
https://doi.org/10.1038/nature06982
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.