@article{Lampens:1919,
      author        = "Lampens, P. and  Oblak, E. and  Duval, D. and  Chareton,
                       M.",
      title         = "{CCD photometry and astrometry for visual double and
                       multiple stars of the HIPPARCOS catalogue III. CCD
                       photometry and differential astrometry for 253 southern
                       ``intermediate'' systems}",
      year          = "2001",
}