@misc{indiciaec90c18ef835e,
  title = {Circadian variability in vigilance performance.},
  author = {Frazier, T. W. and Lipscomb, H. S. and Rummel, J. A.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680045665},
  note = {Source identifier: 19680045665}
}