@article{Ansoldi:2008nH,
  author = "Ansoldi, Stefano",
  title = "{Vacuum and semiclassical gravity: a difficulty and its bewildering significance}",
  doi = "10.22323/1.043.0004",
  journal = "PoS",
  year = 2008,
  volume = "QG-Ph",
  pages = "004"
}