Richardson et al. (2018)
Also: Richardson et al. 2018
Global temperature definition affects achievement of long-term climate goals
Richardson, M., Cowtan, K., & Millar, R. J. (2018). Global temperature definition affects achievement of long-term climate goals. Environmental Research Letters, 13(5), 054004. Link to PDF
https://doi.org/10.1088/1748-9326/aab305
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.