@article{Swiezewski:20161R,
  author = "Swiezewski, Jedrzej",
  title = "{Observers diffeomorphism-invariant description of a general relativistic system}",
  doi = "10.22323/1.224.0176",
  journal = "PoS",
  year = 2016,
  volume = "FFP14",
  pages = "176"
}