@inproceedings{Thiersen:201752,
  author = "Thiersen, Hannes  and  Böttcher, Markus",
  title = "{Gravitational light bending prevents gamma-gamma absorption in gravitational lenses}",
  doi = "10.22323/1.275.0015",
  booktitle = "Proceedings of 4th Annual Conference on High Energy Astrophysics in Southern Africa {\textemdash} PoS(HEASA 2016)",
  year = 2017,
  volume = "275",
  pages = "015"
}