@misc{indiciaecc35e6f6590a,
  title = {First-order symmetric hyperbolic Einstein equations with arbitrary fixed gauge.},
  author = {S Frittelli and OA Reula},
  year = {1996},
  doi = {10.1103/physrevlett.76.4667},
  url = {https://pubmed.ncbi.nlm.nih.gov/10061351/},
  note = {Source identifier: 10061351}
}