@misc{indiciae8089772d34bf,
  title = {Control of smallpox.},
  author = {W H Parry},
  year = {1973},
  doi = {10.1016/s0140-6736(73)90415-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4122023/},
  note = {Source identifier: 4122023}
}