1. IRAS observations of matter around nearby stars
2. Discovery of a shell around Alpha Lyrae
3. Backman, D. E. & Paresce, F. 1993, in Protostars and Planets III, ed. V. Mannings, A. P. Boss, & S. S. Russell (Tucson: Univ. Arizona Press), 1253
4. Batten, A. H. 1989, in Algols, ed. A. H. Batten (Dordrecht: Kluwer), 1
5. Beckwith, S. V. W., Henning, T. & Nakagawa, Y. 2000, in Protostars and Planets IV, ed. V. Mannings, A. P. Boss, & S. S. Russell (Tuscon: Univ. Arizona Press), 533