@article{Ziolkowski:20130l,
  author = "Ziolkowski, Janusz",
  title = "{Determination of the masses of the components of the HDE 226868/Cyg X-1 binary system}",
  doi = "10.22323/1.176.0054",
  journal = "PoS",
  year = 2013,
  volume = "INTEGRAL 2012",
  pages = "054"
}