@misc{indiciaef9093e46fb7d,
  title = {Multipurpose breathing systems.},
  author = {D Humphrey},
  year = {1987},
  doi = {10.1111/j.1365-2044.1987.tb02972.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3469922/},
  note = {Source identifier: 3469922}
}