@misc{indiciae91fffa49fbe7,
  title = {An optical scan system for encoding and tabulation of visually scored sleep data.},
  author = {G Fein and I Feinberg},
  year = {1979},
  doi = {10.1016/0013-4694(79)90112-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/87319/},
  note = {Source identifier: 87319}
}