@misc{indiciae5a760f037ef6,
  title = {Optimum earth-to-mars roundtrip trajectories utilizing a low-thrust power-limited propulsion system.},
  author = {Melbourne, W. G. and Sauer, C. G., Jr.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19640041237},
  note = {Source identifier: 19640041237}
}