@inproceedings{Bisnovatyi-Kogan:2020Dq,
  author = "Bisnovatyi-Kogan, Gennady  and  Tsupko, O. Yu.  and  Perlick, Volker",
  title = "{Shadow of a black hole at local and cosmological distances}",
  doi = "10.22323/1.362.0009",
  booktitle = "Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII {\textemdash} PoS(MULTIF2019)",
  year = 2020,
  volume = "362",
  pages = "009"
}