@misc{indiciae18f6c7cc8c50,
  title = {Nuclear propulsion for manned Mars expedition.},
  author = {Chovit, A. R. and Plebuch, R. K. and Ridolphi, F. and Simmons, L. D.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670055245},
  note = {Source identifier: 19670055245}
}