@article{vanHoof:1998,
      author        = "van Hoof, P. A. M. and  Hajduk, M. and  Zijlstra, A. A.
                       and  Herwig, F. and  Evans, A. and  van de Steene, G. C.
                       and  Kimeswenger, S. and  Kerber, F. and  Eyres, S. P. S.",
      title         = "{The onset of photoionization in Sakurai's Object (V4334
                       Sagittarii)}",
      year          = "2007",
}