@misc{indiciae4988bb0553ee,
  title = {Cauchy data and Hadamard singularities in time-dependent backgrounds.},
  author = {FD Mazzitelli and JP Paz and MA Castagnino},
  year = {1987},
  doi = {10.1103/physrevd.36.2994},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958065/},
  note = {Source identifier: 9958065}
}