@misc{indiciae1e0c83cdd6d4,
  title = {Smallpox eradication: progress and problems.},
  author = {I D Ladnyi and J G Breman},
  year = {1978},
  url = {https://pubmed.ncbi.nlm.nih.gov/223913/},
  note = {Source identifier: 223913}
}