1. Ferin, J., Oberdörster, C., and Penny, D. P. 1992. Pulmonary retention of ultrafine and fine particles in rats.Am. J. Respir. Cell Mot. Biol. 6:535–542.
2. Finch, G. L., Nikula, K. J., Barr, E. B., Seagrave, J. C., Snipes, M. B., Hobbs, C. H., and Mauderly, J. L. 1999. Biokinetics of an ultrafine silver aerosol inhaled by rats.Third Colloquium on Particulate Air Pollution and Human Health, Durham, NC, abstr. p. 31.
3. Hinds, W. C. 1982.Aerosol technology.New York: Wiley.
4. National Center for Environment Assessment. 1996. Air Quality Criteria for Particulate Matter. Research Triangle Park, NC: U.S. Environmental Protection Agency, EPA/600/P-95/001aF.
5. Roth, C., Karg, E., and Heyder, J. 1998. Do inhaled ultrafine particles cause acute health effects in rats? I: Particle production.J. Aerosol Sci.29:S679–S680.