@misc{indiciae979bea3d846b,
  title = {Predictable oxygen concentrations with the Bird respirator.},
  author = {C H Macdonald},
  year = {1968},
  doi = {10.1007/bf03004353},
  url = {https://pubmed.ncbi.nlm.nih.gov/5248380/},
  note = {Source identifier: 5248380}
}