1. US Environmental Protection Agency, National Air Quality and Emissions Trends Report, Special Studies Ed., September, 2003, available at http://www.epa.gov/air/airtrends/aqtrnd03/.
2. US Environmental Protection Agency, NOx Budget Program 2006 Progress Report, September, 2007, available at http://www.epa.gov/airmarkt/progress/nbp06.html.
3. US Environmental Protection Agency, Proposed Clear Skies Legislation, September, 2007, available at http://www.epa.gov/clearskies/.
4. Diode laser absorption sensors for gas-dynamic and combustion flows
5. Applied Combustion Diagnostics;Allen,2002