@inproceedings{Kaufmann:2009sm,
  author = "Kaufmann, Sarah  and  Wagner, Stefan",
  title = "{X ray spectral variability of TeV Blazars}",
  doi = "10.22323/1.063.0044",
  booktitle = "Proceedings of Workshop on Blazar Variability across the Electromagnetic Spectrum {\textemdash} PoS(BLAZARS2008)",
  year = 2009,
  volume = "063",
  pages = "044"
}