@inproceedings{Staubert:2015xQ,
  author = "Staubert, Ruediger",
  title = "{Hercules X-1 - another ’first’: long-term decay of the cyclotron line energy}",
  doi = "10.22323/1.228.0024",
  booktitle = "Proceedings of 10th INTEGRAL Workshop: A Synergistic View of the High-Energy Sky {\textemdash} PoS(Integral2014)",
  year = 2015,
  volume = "228",
  pages = "024"
}