Braganza et al. (2004)
Also: Braganza et al. 2004
Diurnal temperature range as an index of global climate change during the twentieth century
Braganza, K., Karoly, D. J., & Arblaster, J. M. (2004). Diurnal temperature range as an index of global climate change during the twentieth century. Geophysical research letters, 31(13). Link to paper
DOI: 10.1029/2004GL019998
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.