@article{vanCauteren:2061,
      author        = "van Cauteren, P. and  Lampens, P. and  Robertson, C. W.
                       and  Strigachev, A.",
      title         = "{Search for intrinsic variable stars in three open
                       clusters: NGC 1664, NGC 6811, NGC 7209}",
      year          = "2005",
}