@misc{indiciaea0c9b1e84cb5,
  title = {A new geometric invariant on initial data for the Einstein equations.},
  author = {Sergio Dain},
  year = {2004},
  doi = {10.1103/physrevlett.93.231101},
  url = {https://pubmed.ncbi.nlm.nih.gov/15601140/},
  note = {Source identifier: 15601140}
}