Effect of sleep on memory. 3. Controlling for time-of-day effects.

@article{Barrett1972EffectOS,
  title={Effect of sleep on memory. 3. Controlling for time-of-day effects.},
  author={Terry R Barrett and B R Ekstrand},
  journal={Journal of experimental psychology},
  year={1972},
  volume={96 2},
  pages={321-7}
}