@misc{indiciaeabd9bdaa2b97,
  title = {Sleep and Circadian Rhythms in Four Orbiting Astronauts},
  author = {Monk, Timothy H. and Buysse, Daniel J. and Billy, Bart D. and Kennedy, Kathy S. and Willrich, Linda M.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20000020664},
  note = {Source identifier: 20000020664}
}