@misc{indiciaeac23569f43f6,
  title = {Plasma and spinal-fluid blocking factor in SSPE.},
  author = {K W Sell and G B Thurman and A Ahmed and D M Strong},
  year = {1973},
  doi = {10.1056/nejm197301252880418},
  url = {https://pubmed.ncbi.nlm.nih.gov/4682238/},
  note = {Source identifier: 4682238}
}