@misc{indiciaeb77b5f20a629,
  title = {Physician liberation units system.},
  author = {D E Langdon and C K Leeper},
  year = {1970},
  doi = {10.1056/nejm197012172832523},
  url = {https://pubmed.ncbi.nlm.nih.gov/5481769/},
  note = {Source identifier: 5481769}
}