1. Tholen, D. J. & Buie, M. W. Bull. Am. astr. Soc. 19, 859–860 (1987).
2. Tholen, D. J., Buie, M. W., Binzel, R. P. & Frueh, M. L. Science 237, 512–514 (1987).
3. McKinnon, W. B. Nature 311, 355–358 (1984).
4. Burns, J. A. in Satellites (eds Burns, J. A. & Matthews, M. S.) 117–158 (University of Arizona Press, Tucson, 1986).
5. Peale, S. J. in Satellites (eds Burns, J. A. & Matthews, M. S.) 159–223 (University of Arizona Press, Tucson, 1986).