Lutze et al. (1998)
Also: Lutze et al.1998
Elevated atmospheric [CO2] promotes frost damage in evergreen tree seedlings
Lutze, J. L., Roden, J. S., Holly, C. J., Wolfe, J., Egerton, J. J. G., & Ball, M. C. (1998). Elevated atmospheric [CO2] promotes frost damage in evergreen tree seedlings. Plant, Cell & Environment, 21(6), 631-635. Link to paper
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.