1. Carbon Dioxide Information Analysis Center.;TA Boden,1991
2. Bolin B., Döös B.R., Jäger J., and Warrick R.A. (eds): 1986, The Greenhouse Effect, Climatic Change, and Ecosystems, Wiley and Sons.
3. Coops A.J.: 1991, Norsk Geologisk Tidsskrift 71, 179–182.
4. Gates W.L.: 1985, Climatic Change 7, 267–284.
5. Goudriaan J.: 1987, Netherlands Journal of Agricultural Science 35, 177–187.