@article{1309618,
  author = {B. Boccardi and T. P. Kirchbaum and E. Ros and J. A. Zenzus},
  title = {Radio observations of active galactic nuclei with mm-VLBI},
  year = {2017},
  journal = {A\&ARv},
  volume = {25},
  pages = {48},
  language = {eng},
}