@misc{indiciaeff564e7c6039,
  title = {Bronchitis, emphysema, and air.},
  author = {E F Lang},
  year = {1974},
  doi = {10.2214/ajr.120.4.923},
  url = {https://pubmed.ncbi.nlm.nih.gov/4821349/},
  note = {Source identifier: 4821349}
}