Keller (2011)
Also: Keller 2011
Defining the Cretaceous–Tertiary boundary: a practical guide and return to first principles
Keller, G. E. R. T. A. (2011). Defining the Cretaceous-Tertiary boundary: A practical guide and return to first principles. The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas. Link to abstract
DOI: 10.2110/sepmsp.100.023
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.