Hyperboloidal Cauchy data for vacuum Einstein equations and obstructions to smoothness of null infinity.

@article{Andersson1993HyperboloidalCD,
  title={Hyperboloidal Cauchy data for vacuum Einstein equations and obstructions to smoothness of null infinity.},
  author={C Andersson and Chrusciel},
  journal={Physical review letters},
  year={1993},
  volume={70 19},
  pages={2829-2832}
}