Quantification of sleepiness: a new approach.

@article{Hoddes1973QuantificationOS,
  title={Quantification of sleepiness: a new approach.},
  author={E S Hoddes and Vincent P. Zarcone and Hugh Smythe and R. Phillips and William C. Dement},
  journal={Psychophysiology},
  year={1973},
  volume={10 4},
  pages={431-6}
}
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