Raymond et al. (2020)
Also: Raymond et al. 2020
The emergence of heat and humidity too severe for human tolerance
Raymond, C., Matthews, T. & Horton, R.M. (2020). The emergence of heat and humidity too severe for human tolerance. Science Advances. 6(19),eaaw1838. PDF
https://doi.org/10.1126/sciadv.aaw1838
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.