@misc{indiciae5491d6afd74d,
  title = {The emphysema problem.},
  author = {T Simpson},
  year = {1968},
  doi = {10.1016/s0007-0971(68)80013-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/5687961/},
  note = {Source identifier: 5687961}
}