Burch et al. (1962)
Also: Burch et al. 1962
Total Absorptance of Carbon Dioxide in the Infrared
Burch, D. E., Gryvnak, D. A., & Williams, D. (1962). Total absorptance of carbon dioxide in the infrared. Applied Optics, 1(6), 759-765. Link to paper
DOI: https://doi.org/10.1364/AO.1.000759
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.