@misc{indiciae23a6b51743ea,
  title = {Immunization against poliomyelitis.},
  author = {A J Beale},
  year = {1969},
  doi = {10.1093/oxfordjournals.bmb.a070684},
  url = {https://pubmed.ncbi.nlm.nih.gov/4319086/},
  note = {Source identifier: 4319086}
}