1. BGS (2012) Risk List 2012, Minerals UK, Centre for Sustainable Development.
http://www.bgs.ac.uk/mineralsuk/statistics/riskList.html
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2. BRGM (2012) BRGM response to “Public consultation on the preparation of a new communication on raw materials”, page 4. http://ec.europa.eu/enterprise/policies/raw-materials/files/pc-contributions/org-059-brgm_en.pdf. Letzter Zugriff 30.03.2013
3. DOE (2011) Critical Materials Strategy (US Department of Energy), Dezember 2011. http://energy.gov/sites/prod/files/DOE_CMS2011_FINAL_Full.pdf. Letzter Zugriff 30.03.2013
4. EC (2010) Critical raw materials for the EU Report of the Ad-hoc Working Group on defining critical raw materials. European Commission, 30 July 2010. http://ec.europa.eu/enterprise/policies/raw-materials/files/docs/report-b_en.pdf. Letzter Zugriff 30.03.2013
5. EC (2011) Communication from the commission to the European Parliament, the Council, the European Economic and Social Committee and the committee of the regions tacking the challenges in commodity markets and on raw materials. 2. Februar 2011.
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=COM:2011:0025:FIN:en:PDF
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