1. IRAS constraints on a cold cloud around the solar system
2. Discovery of a shell around Alpha Lyrae
3. Backman, D. E. 1998, in Exozodiacal Dust Workshop, ed. D. E. Backman et al. (Moffett Field: NASA), 107
4. Backman, D. E. & Paresce, F. 1993, in Protostars & Planets III, ed. E. H. Levy & J. I. Lunine (Tucson: Univ. Arizona Press), 1253
5. Beichman, C. 2003, in ASP Conf. Ser. 291, Hubble’s Science Legacy: Future Optical/Ultraviolet Astronomy from Space, ed. K. R. Sembach et al. (San Francisco: ASP), 101