1. CRM Innonet http://www.criticalrawmaterials.eu/partners/
2. Raw Materials Initiative http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=COM http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=COM
3. EIP RM http://ec.europa.eu/enterprise/policies/raw-materials/innovation-partnership/ 2014
4. Ore grade decrease as life cycle impact indicator for metal scarcity: the case of copper;Vieira;Env Sci Tech,2012
5. Eurostat statistics http://epp.eurostat.ec.europa.eu/ 2014