1. Backman, D. E. & Paresce, F. 1993, in Protostars and Planets III, ed. E. H. Levy & J. Lunine (Tucson: Univ. Arizona Press)
2. The Age of Gliese 879 and Fomalhaut
3. Bastian, U. & Roeser, S. 1993, in PPM Star Catalogue, Vols. 3 and 4, ed. S. Roeser, L. I. Yagudin, & V. V. Nesterov (Heidelberg: Astron. Rechen-Inst.)