@misc{indiciaee8cf107a6cf0,
  title = {Manned interplanetary mission modes for nuclear propulsion systems.},
  author = {Callies, G. M. and Cannon, G. W. and Chovit, A. R. and Simmons, L. D.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680052813},
  note = {Source identifier: 19680052813}
}