@misc{indiciae8d17eb0c38b3,
  title = {Observer-dependent quantum vacua in curved space.},
  author = {M Castagnino and R Ferraro},
  year = {1986},
  doi = {10.1103/physrevd.34.497},
  url = {https://pubmed.ncbi.nlm.nih.gov/9957167/},
  note = {Source identifier: 9957167}
}