@misc{indiciaec8c3c56a21e2,
  title = {A nonsingular universe.},
  author = {V Mukhanov and R Brandenberger},
  year = {1992},
  doi = {10.1103/physrevlett.68.1969},
  url = {https://pubmed.ncbi.nlm.nih.gov/10045270/},
  note = {Source identifier: 10045270}
}