@misc{indiciae31dea011f081,
  title = {Manned Mars Mission program concepts},
  author = {Hamilton, E. C. and Johnson, P. and Pearson, J. and Tucker, W.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19880065118},
  note = {Source identifier: 19880065118}
}