@misc{indiciaefb6a51d9b966,
  title = {Off-duty concepts for long duration space missions},
  author = {Karnes, E. W. and Loudis, L. A. and Spiritoso, T. and Thomas, J. D.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700057593},
  note = {Source identifier: 19700057593}
}