1. U.S. Environmental Protection Agency.Receptor Model Technical Series, Volume III Revised): CMB User's Manual (Version 7.0);Research Triangle Park, NC, 1990.
2. Watson, J.G., Jr. “Chemical elemental balance receptor model methodology for assessing the sources of fine and total suspended particulate matter in Portland, Oregon,” Ph.D. dissertation, Oregon Graduate Center, Beaverton, Oregon, 1979.
3. U.S. Environmental Protection Agency.Receptor Model Technical Series, Volume I: Overview of Receptor Model Application to Particulate Source Apportionment;EPA-450/4-81-016a, PB82-139429; Research Triangle Park, NC, 1981.
4. U.S. Environmental Protection Agency.Receptor Model Technical Series, Volume II: Chemical Mass Balance;EPA-450/81-016b, PB82-187345; Research Triangle Park, NC, 1982.
5. U.S. Environmental Protection Agency.Receptor Model Technical Series, Volume IV: Technical Considerations in Source Apportionment by Particle Identification;EPA 450/4-83-018, PB84-103340; Research Triangle Park, NC, 1983.