@misc{indiciaee24266833045,
  title = {Control of smallpox.},
  author = {W H Parry},
  year = {1973},
  doi = {10.1016/s0140-6736(73)91619-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4121605/},
  note = {Source identifier: 4121605}
}