@misc{indiciae2cfa06a38174,
  title = {Nuclear rockets for unmanned missions},
  author = {Johnson, P. G. and Lietzke, A. F. and Rom, F. E.},
  year = {1961},
  url = {https://ntrs.nasa.gov/citations/19650070895},
  note = {Source identifier: 19650070895}
}