1. Bonafé, G. Cesari, G. Giovanelli, T. Tirabassi and O. Vittori, Atmos. Environ., 10, 469–474 (1976).
2. Connell, P. S., R. A. Perry and C. J. Howard, Geophys. Res. Lett., 7, 1093–1096 (1980).
3. Hanst, P. L., Adv. Environ. Sci. Technol., 2, 91 (1971).
4. Harris, G. W., W. P. L. Carter, A. M. Winer, J. N. Pitts, Jr., U. Platt and D. Perner, Env. Sci. Technol., in press (1982).
5. Harris, G. W., A. M. Winer and J. N. Pitts, Jr., Presented at Workshop on Optical and Laser Remote Sensing, Monterey, CA, February 9–11, 1982 (following paper).