@misc{indiciae9214545de92e,
  title = {Rigid trachea.},
  author = {A Sakula},
  year = {1968},
  doi = {10.1136/bmj.2.5600.303-d},
  url = {https://pubmed.ncbi.nlm.nih.gov/5646558/},
  note = {Source identifier: 5646558}
}