@misc{indiciae1b229de724a5,
  title = {Smallpox vaccination.},
  author = {P W Copeman},
  year = {1979},
  doi = {10.1136/bmj.2.6193.795-d},
  url = {https://pubmed.ncbi.nlm.nih.gov/519203/},
  note = {Source identifier: 519203}
}