1. IPCC http://www.ipcc.ch/pdf/special-reports/srccs/srccs_chapter2.pdf
2. IPCC http://www.ipcc.ch/pdf/special-reports/srccs/srccs_chapter3.pdf
3. IPCC http://www.ipcc.ch/
4. CATO2 http://www.co2-cato.nl/
5. Merkel T.C. Zhou M. Thomas S. Lin H. Serbanescu A. 2010 2