@misc{indiciae2c459246eef0,
  title = {Modified Beaver respirator.},
  author = {G B BURCHELL},
  year = {1957},
  doi = {10.1093/bja/29.4.183},
  url = {https://pubmed.ncbi.nlm.nih.gov/13426361/},
  note = {Source identifier: 13426361}
}