1. Extended Semi-Annual Data Summary Report for the Chemical Speciation of PM2.5 Filter Samples Project. RTI/07565/06DS, Research Triangle Institute, Research Triangle Park, NC, 2004.
2. Hopke, P.K. Receptor Modeling in Environmental Chemistry. John Wiley & Sons: New York, 1985.
3. SPECIATE version 3.2. U.S. Environmental Protection Agency: Research Triangle Park, NC. 2002.