@misc{indiciaea7805e1573ab,
  title = {An ear oximeter using D-C. Operational amplifiers.},
  author = {W Paul and C R Woolf},
  year = {1967},
  doi = {10.1139/y67-118},
  url = {https://pubmed.ncbi.nlm.nih.gov/6064048/},
  note = {Source identifier: 6064048}
}