@misc{indiciae4e7e1b07bc9b,
  title = {The Doser external counting device.},
  author = {D M Williams and A Wessell and T P Brock},
  year = {1999},
  doi = {10.1378/chest.116.5.1499},
  url = {https://pubmed.ncbi.nlm.nih.gov/10559131/},
  note = {Source identifier: 10559131}
}