Huang et al. (2000)
Also: Huang et al. 2000
Temperature trends over the past five centuries reconstructed from borehole temperatures
Huang, S., Pollack, H. N., & Shen, P.-Y. (2000). Temperature trends over the past five centuries reconstructed from borehole temperatures. Nature, 403(6771), 756758. Link to abstract
doi:10.1038/35001556
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.