@misc{indiciae4c7712ffe501,
  title = {Comparative study of various ventilating tubes.},
  author = {W S Crysdale},
  doi = {10.1177/00034894760850s250},
  url = {https://pubmed.ncbi.nlm.nih.gov/1267357/},
  note = {Source identifier: 1267357}
}