@article{Wu:2009du,
  author = "Wu, Qingwen  and  Gu, Minfeng",
  title = "{The hard X-ray spectral evolution in X-ray binaries and ULXs}",
  doi = "10.22323/1.062.0064",
  journal = "PoS",
  year = 2009,
  volume = "MQW7",
  pages = "064"
}