1. J.C. Trijonis, W.C. Malm, M. Pitchford, W.H. White, R. Charison, and R. Husar , “Visibility: existing and historical conditions—causes and effects,” NAPAP Report 24, III, pp. 24∕31 (Oct. 1990);
2. available using http://vista.cira.colostate.edu/improve/Publications/publications.htm.
3. EPA, “Air quality criteria for particulate matter,” II, EPA 600∕P-95∕001bF, pp. 8∕1, 8∕4, 8∕79, 8∕123–8∕125 (Apr. 1996).
4. Visual air quality simulation techniques
5. Development of an improved image processing based visibility model