@misc{indiciae6ae62b3473ed,
  title = {Viruses and progressive multifocal leukoencephalopathy.},
  author = {P H Black and M S Hirsch},
  year = {1972},
  doi = {10.1056/nejm197202242860810},
  url = {https://pubmed.ncbi.nlm.nih.gov/4333084/},
  note = {Source identifier: 4333084}
}