Keeling (1979)
Also: Keeling 1979
The Suess effect: 13Carbon-14Carbon interrelations.
Keeling, C. D. (1979). The Suess effect: 13Carbon-14Carbon interrelations.Environment International, 2(46), 229300.
doi:http://doi.org/10.1016/0160-4120(79)90005-9
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.