@misc{indiciae120187e89264,
  title = {Pulse oximetry: a practical review.},
  author = {C D Hanning and J M Alexander-Williams},
  year = {1995},
  doi = {10.1136/bmj.311.7001.367},
  url = {https://pubmed.ncbi.nlm.nih.gov/7640545/},
  note = {Source identifier: 7640545}
}