@article{Grinberg:2013+c,
  author = "Grinberg, Victoria",
  title = "{Cygnus X-1: shedding light on the spectral variability of a black hole}",
  doi = "10.22323/1.176.0050",
  journal = "PoS",
  year = 2013,
  volume = "INTEGRAL 2012",
  pages = "050"
}