Franks et al. (2014)
Also: Franks et al. 2014
New constraints on atmospheric CO2 concentration for the Phanerozoic.
Franks, P. J., Royer, D. L., Beerling, D. J., Van de Water, P. K., Cantrill, D. J., Barbour, M. M., & Berry, J. A. (2014). New constraints on atmospheric CO2 concentration for the Phanerozoic.Geophysical Research Letters, 41(13), 2014GL060457 doi:http://doi.org/10.1002/2014GL060457
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.