Foukal et al. (2006)
Also: Foukal et al. 2006, Foukal 2006
Variations in solar luminosity and their effect on the Earth's climate
Foukal, P., Fröhlich, C., Spruit, H., & Wigley, T. M. L. (2006). Variations in solar luminosity and their effect on the Earth's climate. Nature, 443(7108), 161-166. Link to paper
doi:10.1038/nature05072
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.