@misc{indiciaeed70c2385aa4,
  title = {A manned Mars artificial gravity vehicle},
  author = {Schultz, David N. and Rupp, Charles C. and Hajos, Gregory A. and Butler, John M., Jr.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19890055994},
  note = {Source identifier: 19890055994}
}