@misc{indiciae38d1e0601b11,
  title = {PiM subtypes in COPD.},
  author = {F Kueppers},
  year = {1981},
  doi = {10.1378/chest.80.2.247},
  url = {https://pubmed.ncbi.nlm.nih.gov/6972857/},
  note = {Source identifier: 6972857}
}