1. Critical Raw Materials for the European Union;European Commission,2010
2. M. Buchert, D. Schueler, D. Bleher, Critical Metals for Future Sustainable Technologies and Their Recycling Potential; UNEP: July, 2009.
3. Committee on Critical Mineral Impacts of the US Economy, Minerals, Critical Minerals and the US Economy;US National Research Council,2008
4. R.L. Moss, E. Tzimas, H. Kara, P. Willis, J. Kooroshy, Critical Metals in Strategic Energy Technologies, Assessing Rare Metals as Supply-Chain Bottlenecks in Low-Carbon Energy Technologies, EUR 24884 EN – 2011.
5. The Impact of Tellurium Supply on Cadmium Telluride Photovoltaics