@misc{indiciaef8d3d59d5aee,
  title = {Quantum field theory with null-fronted metrics.},
  author = {O Levin and A Peres},
  year = {1994},
  doi = {10.1103/physrevd.50.7421},
  url = {https://pubmed.ncbi.nlm.nih.gov/10017726/},
  note = {Source identifier: 10017726}
}