@misc{indiciae3e7355e76717,
  title = {A proposed USAF fatigue evaluation program based upon recent systems experience},
  author = {Haviland, G. P. and Purkey, G. F.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720022251},
  note = {Source identifier: 19720022251}
}