1. McMurry, P.H.; Shepard M.F.; Vickery, J.S.; Eds. Particulate Matter Science for Policy Makers: A NARSTO Assessment; Cambridge University Press: New York, 2004.
2. U.S. Environmental Protection Agency. Appendix L to Part 50—Reference Method for the Determination of Fine Particulate Matter as PM2.5 in the Atmosphere. Fed. Regist. 2001, Code of Federal Regulations 40, Part 50.