@article{Hallahan:2009DZ,
  author = "Hallahan, Redmond",
  title = "{The Deca-parsec Scale Radio Structures of BL Lac Objects}",
  doi = "10.22323/1.072.0029",
  journal = "PoS",
  year = 2009,
  volume = "IX EVN Symposium",
  pages = "029"
}