@misc{indiciae41b9004ea190,
  title = {Impedance pneumography.},
  author = {A F Heck and W Reichl and V R Hall},
  year = {1972},
  doi = {10.1016/s0140-6736(72)92045-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4116165/},
  note = {Source identifier: 4116165}
}