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2. Nanotoxicology: An Emerging Discipline Evolving from Studies of Ultrafine Particles
3. US Environmental Protection Agency: Nanotechnology Workgroup/EPA's Science Policy Council. Nanotechnology White Paper, 68-70, December 2, 2005. http://www.epa.gov/OSA/pdfs/EPA_nanotechnology_white_paper_external_review_draft_12-02-2005.pdf.