@misc{indiciae610d6d9694bb,
  title = {Mars landing mission mode comparison},
  author = {Hellwig, H. W. and Mc Neely, J. T. and Taylor, J. J.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680020516},
  note = {Source identifier: 19680020516}
}