@article{Staubert:2013uz,
  author = "Staubert, Ruediger",
  title = "{Hercules X-1: variations of the cyclotron line energy with flux, with phase and with time}",
  doi = "10.22323/1.176.0010",
  journal = "PoS",
  year = 2013,
  volume = "INTEGRAL 2012",
  pages = "010"
}