Meehl 2004
Also: Meehl 2004
Combinations of Natural and Anthropogenic Forcings in Twentieth-Century Climate
Meehl, G.A., Washington, W.M., Ammann, C.M., Arblaster, J.M., Wigley, T. M. L. & Tebaldi, C. (2004). Combinations of Natural and Anthropogenic Forcings in Twentieth-Century Climate. Journal of Climate. 17(19),3721-3727. PDF
https://doi.org/10.1175/1520-0442(2004)0172.0.co;2
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.