@misc{indiciae28521f8263af,
  title = {A variable-deadspace device for use with the Engström respirator.},
  author = {S Jeretin and T Wandycz},
  year = {1971},
  doi = {10.1097/00000542-197106000-00026},
  url = {https://pubmed.ncbi.nlm.nih.gov/4997769/},
  note = {Source identifier: 4997769}
}