@misc{indiciae38695df30b7b,
  title = {Modified angle piece and expiratory valve.},
  author = {C J POTTER},
  year = {1961},
  doi = {10.1093/bja/33.12.666},
  url = {https://pubmed.ncbi.nlm.nih.gov/14488282/},
  note = {Source identifier: 14488282}
}