Francey et al. 1999
Also: Francey et al. (1999)
A 1000-year high precision record of δ13C in atmospheric CO2
Francey et al. (1999). A 1000-year high precision record of δ13C in atmospheric CO2.Tellus B: Chemical and Physical Meteorology. 51. 170-192. Link to article.
https://doi.org/10.3402/tellusb.v51i2.16269
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.