@misc{indiciaebe39b09da457,
  title = {Emergency call service.},
  author = {A G Houlson},
  year = {1970},
  doi = {10.1016/s0140-6736(70)91483-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4196040/},
  note = {Source identifier: 4196040}
}