@misc{indiciaecc9d0e454570,
  title = {Ring vaccination and smallpox control.},
  author = {Mirjam Kretzschmar and Susan van den Hof and Jacco Wallinga and Jan van Wijngaarden},
  year = {2004},
  doi = {10.3201/eid1005.030419},
  url = {https://pubmed.ncbi.nlm.nih.gov/15200816/},
  note = {Source identifier: 15200816}
}