@misc{indiciaeea8e2fad6bb5,
  title = {Nonrebreathing valves.},
  author = {M K SYKES},
  year = {1959},
  doi = {10.1093/bja/31.10.450},
  url = {https://pubmed.ncbi.nlm.nih.gov/13836178/},
  note = {Source identifier: 13836178}
}