@misc{indiciaedfcaeec3030b,
  title = {Chronic obstructive pulmonary disease.},
  author = {P M Penna},
  year = {1973},
  doi = {10.1016/s0003-0465(16)32824-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/4759578/},
  note = {Source identifier: 4759578}
}