@article{Wambsganss2000,
  author    = {Wambsganß, Joachim},
  title     = {Gravitationslinsen - universelle Werkzeuge der Astrophysik},
  year      = {2000},
  language  = {de}
}
@article{Wambsganss2000,
  author    = {Wambsganß, Joachim},
  title     = {N{\"u}tzliche Illusionen : Astrophysik mit Gravitationslinsen},
  year      = {2000},
  language  = {de}
}
@article{Wambsganss2000,
  author    = {Wambsganß, Joachim},
  title     = {Planeten um andere Sterne},
  year      = {2000},
  language  = {de}
}