@article{Papavassiliou:2007SJ,
  author = "Papavassiliou, Joannis  and  Binosi, Daniele  and  Pilaftsis, Apostolos",
  title = "{Displacement Operator Formalism}",
  doi = "10.22323/1.021.0163",
  journal = "PoS",
  year = 2007,
  volume = "HEP2005",
  pages = "163"
}