1. Browell, E. V., Butler, C. F., Ismail, S., Robinette, P. A., Carter, A. F., Higdon, N. S., Toon, O. B., Schoeberl, M. R., and Tuck, A. F., 1990, Airborne Lidar observations in the wintertime Arctic stratosphere: Polar stratospheric clouds, Geophys. Res. Lett. 17, 385?388.
2. Browell, E. V., Poole, L. R., McCormick, M. P., Ismail, S., Butler, C. F., Kooi, S. A., Szedlmayer, M. S., Jones, R., Krueger, A., and Tuck, A., 1988, Large-scale variations in ozone and polar stratospheric clouds measured with airborne Lidar during formation of the 1987 ozone hole over Antarctica, paper presented at Polar Ozone Workshop, Snowmass in Aspen, Colorado, 9?13 May, 1988.
3. Chan, K. R., Scott, S. G., Bui, T. P., Bowen, S. W., and Day, J., 1989, Temperature and horizontal wind measurements on the ER-2 aircraft during the 1987 Airborne Antarctic Ozone Experiment, J. Geophys. Res. 94, 11573?11587.
4. Coffey, M. T., Mankin, W. G., and Goldman, A., 1989, Airborne measurements of stratospheric constituents over Antarctica in the Austral spring, 1987. 2. Halogen and nitrogen trace gases, J. Geophys. Res. 94, 16597?16613.
5. Crutzen, P. J. and Arnold, F., 1986, Nitric acid cloud formation in the cold Antarctic stratosphere: a major cause for the springtime ?ozone hole?, Nature 324, 651?655.