1. EC 2011 Official Journal of the European Union (20.10.2011) Recommendations. Commission Recommendation of 18 October 2011 on the definition of nanomaterial http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2011:275:0038:0040:EN:PDF
2. Woodrow Wilson Center for International Center for Scholars 2011 Project on Emerging Nanotechnologies: Nanotechnology Consumer Products Inventory http://www.nanotechproject.org/
3. NIOSH 2010 Occupational Exposure to Carbon Nanotubes and Nanofibres http://www.cdc.gov/niosh/docket/review/docket161A/pdfs/carbonNanotubeCIB_PublicReviewOfDraft.pdf
4. A silver man;Tomi;Lancet,2004
5. NIOSH 2011 Occupational exposure to titanium dioxide http://www.cdc.gov/niosh/docs/2011-160/pdfs/2011-160.pdf