1. Baumert, K.A., 1999. Understanding additionality. In: Goldenberg, J., Reid, W. (Eds.), Promoting Development while Limiting Greenhouse Gas Emission. UNDP, New York.
2. BVW, 1999. Windenergie 1999, Bundesverband WindEnergie e.V., Osnabrück.
3. Climate Trust, 2001. The climate trust and Seattle City light. Internet: http//www.climatetrust.org/2001.html, accessed: 9th May 2001.
4. EcoSecurities, 2001. Prototype carbon fund market intelligence report—prepared for PCFPlus.
5. FME, 2000. Climate Protection by Using Renewable Energy Sources—Abridged Version. Federal Ministry for the Environment, Nature Conservation and Nuclear Safety, Berlin.