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Astron. Astrophys. 327, 11-21 (1997) AcknowledgementsI acknowledge the support received from the Spanish DGICYT through project PB93-0134. This research has made use of the Simbad database, operated at CDS, Strasbourg, France.
© European Southern Observatory (ESO) 1997 Online publication: April 8, 1998 ![]() |