@article{Bozza:2008jo,
  author = "Bozza, Valerio  and  Calchi Novati, Sebastiano  and  Mancini, Luigi",
  title = "{Gravitational lensing by the supermassive black hole in M31}",
  doi = "10.22323/1.054.0044",
  journal = "PoS",
  year = 2008,
  volume = "GMC8",
  pages = "044"
}