@misc{indiciae0a5d420b665c,
  title = {Oxygen concentrators: a primary oxygen supply source.},
  author = {R M Friesen and M B Raber and D H Reimer},
  year = {1999},
  doi = {10.1007/bf03015531},
  url = {https://pubmed.ncbi.nlm.nih.gov/10608216/},
  note = {Source identifier: 10608216}
}