@misc{indiciae0cf0a6bffe4f,
  title = {Mars sample return missions, precursors to manned planetary exploration},
  author = {Stager, D. N. and Cruz, M. I. and Balmanno, W. F. and Hieatt, J. L.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910029397},
  note = {Source identifier: 19910029397}
}