Levin & Hesshaimer (2000)
Also: Levin & Hesshaimer 2000
Radiocarbon – A Unique Tracer of Global Carbon Cycle Dynamics
Levin, I., Hesshaimer, V. (2000). Radiocarbon – A Unique Tracer of Global Carbon Cycle Dynamics. Radiocarbon. 42(1),69-80. PDF
https://doi.org/10.1017/s0033822200053066
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.