@misc{indiciae4d6db07cbc89,
  title = {A pneumothorax valve.},
  author = {R K Knight},
  year = {1967},
  doi = {10.1016/s0140-6736(67)91827-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4163127/},
  note = {Source identifier: 4163127}
}