@misc{indiciae338cf7f1648a,
  title = {Protective layer covering pathogenic treponemata.},
  author = {S CHRISTIANSEN},
  year = {1963},
  doi = {10.1016/s0140-6736(63)92309-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/14021145/},
  note = {Source identifier: 14021145}
}