@inproceedings{Diehl:2009Ur,
  author = "Diehl, Roland",
  title = "{Gamma-Rays from Positron Annihilation}",
  doi = "10.22323/1.067.0001",
  booktitle = "Proceedings of 7th INTEGRAL Workshop  {\textemdash} PoS(Integral08)",
  year = 2009,
  volume = "067",
  pages = "001"
}