@inproceedings{Kovalev:2009uF,
  author = "Kovalev, Yuri Y.  and  Pushkarev, Alexander  and  Lobanov, Andrei  and  Sokolovsky, Kirill",
  title = "{Opacity in parsec-scale jets of active galactic nuclei }",
  doi = "10.22323/1.072.0007",
  booktitle = "Proceedings of The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting {\textemdash} PoS(IX EVN Symposium)",
  year = 2009,
  volume = "072",
  pages = "007"
}