@misc{indiciaed01c0f8c7729,
  title = {John Snow and research.},
  author = {D A Shephard},
  year = {1989},
  doi = {10.1007/bf03011450},
  url = {https://pubmed.ncbi.nlm.nih.gov/2650899/},
  note = {Source identifier: 2650899}
}