Plasma and spinal-fluid blocking factor in SSPE.

@article{Sell1973PlasmaAS,
  title={Plasma and spinal-fluid blocking factor in SSPE.},
  author={Kenneth W. Sell and Gary B. Thurman and Ahmed Awad E. Ahmed and Douglas M. Strong},
  journal={The New England journal of medicine},
  year={1973},
  volume={288 4},
  pages={215-6}
}