@misc{indiciae5900e78610c7,
  title = {An improved safety system.},
  author = {W J Hartin and L J Goodman},
  year = {1971},
  doi = {10.1097/00004032-197101000-00008},
  url = {https://pubmed.ncbi.nlm.nih.gov/5559155/},
  note = {Source identifier: 5559155}
}