@misc{indiciaefa7e06d135e1,
  title = {Two early artificial ventilators.},
  author = {J D Whitby},
  year = {1973},
  doi = {10.1093/bja/45.4.391},
  url = {https://pubmed.ncbi.nlm.nih.gov/4574552/},
  note = {Source identifier: 4574552}
}