@misc{indiciaea3a466a237c1,
  title = {Endemic syphilis in Bulgaria.},
  author = {G Spirov},
  year = {1991},
  doi = {10.1136/sti.67.5.428},
  url = {https://pubmed.ncbi.nlm.nih.gov/1743721/},
  note = {Source identifier: 1743721}
}