1. Maynard, A. & Aitken, R. J. Nat. Nanotech. 11, 998–1000 (2016).
2. Davies, J. C. Managing the Effects of Nanotechnology (Woodrow Wilson International Center for Scholars, 2006);
http://go.nature.com/2udyt4T
3. Savolainen, K. et al. Nanosafety in Europe 2015–2025: Towards Safe and Sustainable Nanomaterials and Nanotechnology Innovations (Finnish Institute of Occupational Health, 2013);
http://go.nature.com/2u8JTXX
4. Hansen. et al. Environ. Sci. Nano 4, 282–291 (2016).
5. Categorisation of Manufactured Nanomaterials: Workshop Report ENV/JM/MONO(2016)9 (OECD, 2016);
http://go.nature.com/2uQY5lS