1. Sharp edges of planetary rings
2. The dynamics of elliptical rings
3. Ultraviolet Spectrometer Observations of Uranus
4. Elliot, J. L. & Nicholson, P. D. 1984, in Planetary Rings, ed. R. Greenberg & A. Brahic (Tucson: Univ. Arizona Press), 25
5. Esposito, L.W., Brahic, A., Burns, J. A. & Marouf, E. A. 1991, in Uranus, ed. J. T. Bergstrahl, E. D. Miner, & M. S. Matthews (Tucson: Univ. Arizona Press), 410