1. The Second Report on the Adequacy of the Global Observing Systems for Climate in Support of the UNFCCC,2003
2. Implementation Plan for the Global Observing System for Climate in Support of the UNFCCC,2004
3. Implementation Plan for the Global Observing System for Climate in Support of the UNFCCC (2010 Update),2010
4. Systematic Observation Requirements for Satellite-based Products for Climate,2006
5. http://www.ceos.org/images/PDFs/CEOSResponse_1010A.pdf