@misc{indiciaeae3b6a166ea8,
  title = {Faults in expiratory valves.},
  author = {R H Marsh and P M Weir and R D Marshall},
  year = {1985},
  doi = {10.1111/j.1365-2044.1985.tb10880.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3860020/},
  note = {Source identifier: 3860020}
}