1. Intercomparison and characterization of 23 Aethalometers under laboratory and ambient air conditions: procedures and unit-to-unit variabilities
2. DeBell, L.J., Gebhart, K.A., Hand, J.L., Malm, W.C., Pitchford, M.L., Schichtel, B.A., White, W.H. (2006) Spatial and seasonal patterns and temporal variability of haze and its constituents in the United States: Report IV. CIRA, Cooperative Institute for Research in the Atmosphere, Colorado State University.
3. Hand, J.L., Malm, W.C. (2006) Review of the IMPROVE equation for Estimating ambient light extinction coefficients. report, 146 pp., CIRA, Colorado State University., Fort Collins. (Available at http://vista.cira.colostate.edu/improve/Publications/GrayLit/016_IMPROVEeqReview/IMPROVEeqReview.htm).
4. Hansen, A. (2005) The Aethalometer manual, Magee Scientific, Berkeley, California, USA.
5. Current challenges of improving visibility due to increasing nitrate fraction in PM2.5 during the haze days in Beijing, China