@misc{indiciae9ecc5d814855,
  title = {A variable positive end expiratory pressure valve.},
  author = {F M Emery and D Malton},
  year = {1972},
  doi = {10.1093/bja/44.9.991-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/4564268/},
  note = {Source identifier: 4564268}
}