@misc{indiciae829cf0736ad5,
  title = {Observer dependence in quantum cosmology.},
  author = {E Calzetta and A Kandus},
  year = {1993},
  doi = {10.1103/physrevd.48.3906},
  url = {https://pubmed.ncbi.nlm.nih.gov/10016666/},
  note = {Source identifier: 10016666}
}