@misc{indiciae8abe65665634,
  title = {Titration method for an ointment type smallpox vaccine in embryonated chicken eggs.},
  author = {B Mettier and I Haenzel and M Majer},
  year = {1974},
  doi = {10.1016/s0092-1157(74)80010-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4416657/},
  note = {Source identifier: 4416657}
}