@misc{indiciae03af51cec260,
  title = {Respiratory muscle training.},
  author = {L J Sonne},
  year = {1984},
  doi = {10.1378/chest.86.6.939},
  url = {https://pubmed.ncbi.nlm.nih.gov/6499562/},
  note = {Source identifier: 6499562}
}