1. Turco, R. P., Toon, O. B., Ackerman, T. P., Pollack, J. B. & Sagan, C. Science 222, 1283–1292 (1983).
2. MacCracken, M. C. Pap. at 3rd Int. Conf. on Nuclear War, Erice, (Lawrence Livermore National Laboratory, UCRL-89770, 1983).
3. Aleksandrov, V. V. & Stenchikov, G. L. The Proceeding on Applied Mathematics (The Computing Centre of the USSR Academy of Sciences, 1983).
4. Covey, C., Schneider, S. H. & Thompson, S. L. Nature 308, 21–25 (1984).
5. Thompson, S. L. et al. Ambio (in the press).