@inproceedings{Fabrika:2018Af,
  author = "Fabrika, Sergei N.",
  title = "{Ultraluminous X-ray sources. Optical data.}",
  doi = "10.22323/1.288.0046",
  booktitle = "Proceedings of Accretion Processes in Cosmic Sources {\textemdash} PoS(APCS2016)",
  year = 2018,
  volume = "288",
  pages = "046"
}