@misc{indiciae89f56411ed7e,
  title = {Piloted Mars missions using cryogenic and storable propellants},
  author = {Striepe, Scott A. and Desai, Prasun N.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930068906},
  note = {Source identifier: 19930068906}
}