@misc{indiciae0270e7a7076f,
  title = {Comparison of advanced propulsion capabilities for future planetary missions},
  author = {Niehoff, J. C. and Friedlander, A. L.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740054939},
  note = {Source identifier: 19740054939}
}