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Astron. Astrophys. 363, 837-842 (2000) AcknowledgementsOur research was supported in part by PRODEX (Gravitational lens studies with HST), by contract P4/05 "Pôle d'Attraction Interuniversitaire" (OSTC, Belgium), by contract 1994-99 of "Action de Recherches Concertés" (Communauté Française, Belgium) and by the "Fonds National de la Recherche Scientifique" (Belgium). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: December 5, 2000 ![]() |