@article{Klochkov:2010rk,
  author = "Klochkov, Dmitry",
  title = "{Monitoring of pulse period in Her X-1 with Swift/BAT: evidence of mass ejection}",
  doi = "10.22323/1.096.0054",
  journal = "PoS",
  year = 2010,
  volume = "extremesky2009",
  pages = "054"
}