@misc{indiciae6535c6b503ca,
  title = {A flow controlled expiratory valve.},
  author = {M R Nott and J S Shah},
  doi = {10.1111/j.1365-2044.1979.tb06391.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/517734/},
  note = {Source identifier: 517734}
}