@misc{indiciaedf6161e24782,
  title = {Oxygen concentrators.},
  author = {D Lush},
  year = {1986},
  doi = {10.1111/j.1365-2044.1986.tb12715.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3946782/},
  note = {Source identifier: 3946782}
}