@misc{indiciaec182ac98ec5b,
  title = {St. John Ambulance Air Wing.},
  author = {D H Clark},
  year = {1973},
  doi = {10.1136/bmj.3.5880.589-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/4580219/},
  note = {Source identifier: 4580219}
}