Affiliation: | Astronomisches Institut der Universität Tübingen, FRG;Laboratoire de Physique Stellaire et Planétaire, Verrières-le-Buisson, France;Royal Greenwich Observatory, Hailsham, UK;European Space Research and Technology Centre, Noordwijk, Netherlands;Rutherford and Appleton Laboratories, Chilton, UK;Marconi Space and Defence Systems, Stanmore, UK;Laboratorium voor Ruimte-Onderzoek, Utrecht, Netherlands;Institut d''Astrophysique, Liège, Belgium;Observatoire de Paris, Meudon, France;Osservatorio Astronomico, Padova, Italy |