@misc{indiciae811537f2be7e,
  title = {Interplanetary guidance system requirements study. Volume 2 - Computer program descriptions. Part 8 - Program description for matched interplanetary free-fall trajectories},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19680002380},
  note = {Source identifier: 19680002380}
}