1. Department of Energy, Office of Fossil Fuels, DoE, USA, 2011. www.fossilenergy.gov.
2. EPA-US. www.epa.gov.
3. The Achievements of the Copenhagen Summit, 2010.
4. 3rd Carbon Capture and Storage Conference, Bari, Italy, May 2011.
5. IPCC Special Report on CO2 Capture and Storage, 2005.