@misc{indiciae6c2d0e4090aa,
  title = {Controlled breathing pattern in COPD.},
  author = {M A Blegen},
  doi = {10.1002/j.2048-7940.1981.tb01401.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6908519/},
  note = {Source identifier: 6908519}
}