Briffa et al. (1998)
Also: Briffa et al. 1998
Trees tell of past climates: but are they speaking less clearly today?
Briffa, K. R., Schweingruber, F. H, Jones, P. D., Osborn, T. J., Harris, I. C., Shiyatov, S. G., Vaganov, E. A. & Grudd, H. (1998). Trees tell of past climates: but are they speaking less clearly today?. Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences. 353(1365),65-73. PDF
https://doi.org/10.1098/rstb.1998.0191
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.