@inproceedings{Wucknitz:2007Qm,
  author = "Wucknitz, Olaf",
  title = "{Gravitational lensing}",
  doi = "10.22323/1.036.0029",
  booktitle = "Proceedings of 8th European VLBI Network Symposium {\textemdash} PoS(8thEVN)",
  year = 2007,
  volume = "036",
  pages = "029"
}