@misc{indiciae5c716f70f43a,
  title = {Smallpox vaccinations.},
  author = {E A Piszczek and E L Stebbins and J Adriani and G F Lull and O K Niess},
  year = {1972},
  doi = {10.2105/ajph.62.12.1565},
  url = {https://pubmed.ncbi.nlm.nih.gov/4637870/},
  note = {Source identifier: 4637870}
}