1) Engelman, R. J.: Scavenging prediction using ratios of concentration in air and precipitation, J. Appl. Meteorol., 10, 493-497 (1971).
2) Scott, B. C.: Predictions of in-cloud conversion rates of SO2 to SO42-based upon a simple chemical and dynamical model, Atmos. Environ., 16, 1735-1752 (1982).
4) Niemann, B. L.: Scavenging ratios for exceptional wet SO42-episodes in eastern North America from three event networks, Precipitation Scavenging Dry Deposition, and Resuspension, Elsevier Science Publishing Co., Inc., 217-227 (1983).