@misc{indiciae89956061c06f,
  title = {A disposable bag spirometer.},
  author = {D E Laughlin and G N Bedell},
  year = {1968},
  doi = {10.1164/arrd.1968.98.3.512},
  url = {https://pubmed.ncbi.nlm.nih.gov/5673107/},
  note = {Source identifier: 5673107}
}