@misc{indiciaed37499bdecee,
  title = {SWINGBY - A low thrust interplanetary swingby trajectory optimization program, volume 2 Final report},
  author = {Hipkins, C. and Horsewood, J. L.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710021821},
  note = {Source identifier: 19710021821}
}