@article{Kudryavtseva:2009m4,
  author = "Kudryavtseva, Nadezhda",
  title = "{Activity cycles of blazars and quasars from the VLBI observations}",
  doi = "10.22323/1.072.0008",
  journal = "PoS",
  year = 2009,
  volume = "IX EVN Symposium",
  pages = "008"
}