1. Trace Elements Emissions from Coal Combustion and Gasification;Clarke;IEA Coal Research,1992
2. Review of selenium toxicity in the aquatic food chain;Hamilton;Sci. Total Environ.,2004
3. Clean Air Act Amendment;US Government,1990
4. A global atmospheric selenium budget;Mosher;J. Geophys. Res.,1987
5. US Environmental Protection Agency, Mercury and air toxics Standards (MATS). http://www3.epa.gov/mats/index.html.