Gutjahr et al. (2017)
Also: Gutjahr et al. 2017
Very large release of mostly volcanic carbon during the Palaeocene–Eocene Thermal Maximum
Gutjahr, M., Ridgwell, A., Sexton, P.F., Anagnostou, E., Pearson, P.N., Pälike, H., Norris, R.D., Thomas, E. & Foster, G.L. (2017). Very large release of mostly volcanic carbon during the Palaeocene–Eocene Thermal Maximum. Nature. 548(7669),573-577. PDF
https://doi.org/10.1038/nature23646
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.