@misc{indiciae619bc97d9331,
  title = {Formalizing the slow-roll approximation in inflation.},
  author = {AR Liddle and P Parsons and JD Barrow},
  year = {1994},
  doi = {10.1103/physrevd.50.7222},
  url = {https://pubmed.ncbi.nlm.nih.gov/10017703/},
  note = {Source identifier: 10017703}
}