Mann et al. (2008)
Also: Mann et al. 2008
Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia
Mann, M. E., Zhang, Z., Hughes, M. K., Bradley, R. S., Miller, S. K., Rutherford, S. & Ni, F. (2008). Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia. Proceedings of the National Academy of Sciences. 105(36),13252-13257. PDF
https://doi.org/10.1073/pnas.0805721105
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.