Spruijt, H. ; Burrows, K. ; Andersen, J. ; Marsden, S. ; Tilmant, J.
Pub. info.:
Proceedings of the ESA Electronic Components Conference, held at the Conference Centre, ESTEC, Noordwijk, the Netherlands, 12-16 November 1990. pp.159-164, 1991. Paris. ESA Publications Division
Hipparcos, Venice '97 : Isola di S. Giorgio, Venice,Italy, 13-16 May 1997 : presentation of the Hipparcos and Tycho Catalogues and first astrophysical results of the Hipparcos Space Astrometry Mission. pp.693-698, 1997. Noordwijk. ESA Publications Division