@misc{indiciae48c1c0ebb677,
  title = {Crew productivity issues in long-duration space flight},
  author = {Nicholas, John M. and Foushee, H. Clayton and Ulschak, Francis L.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19880035103},
  note = {Source identifier: 19880035103}
}