Raup & Sepkoski (1982)
Also: Raup & Sepkoski 1982
Mass Extinctions in the Marine Fossil Record
p>Raup, D. M., Sepkoski, J. J. (1982). Mass Extinctions in the Marine Fossil Record. Science. 215(4539),1501-1503. Article
https://doi.org/10.1126/science.215.4539.1501
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.