1. Astrium 2002, in Final Report on the Gaia System Level Technical Reassessment Study, Document Ref. EF5/FR/PC/038.02, Astrium, 2002-06-27
2. ESA 2000, in Gaia Concept and Technology Study Report, ESA-SCI(2000)4
3. ESA 2005, in The Three-Dimensional Universe with Gaia, ESA SP-576, Proc. of a conference held at Obs. de Paris-Meudon, France, Oct. 4-7, 2004, ed. C. Turon, K. O'Flaherty, & M. A. C. Perryman, in press
4. Lindegren, L. 2001, Gaia Technical Document GAIA-LL-034
5. Lindegren, L. 2003, Gaia Technical Document GAIA-LL-044