@misc{indiciae28c01dbf7ebe,
  title = {Manned Mars Missions. Working group papers, volume 1, section 1-4},
  author = {Michael B Duke and Paul W Keaton},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870008289},
  note = {Source identifier: 19870008289}
}