1. OECD/IEA. World Energy Outlook 2012. Paris; 2012.
2. The White House. Administration Announces U.S. Emission Target for Copenhagen. Washington D.C.: The White House; 2009.
3. EC. Energy Roadmap 2050—COM(2011) 885/2. Brussels: European Commission; 2011.
4. OECD/IEA. Energy Technology Perspectives 2012. Paris: International Energy Agency; 2012.
5. Eurelectric. Flexible generation: backing up renewables. Report D/2011/12.105/47. Brussels; 2011.