@misc{indiciae100093506484,
  title = {Three computer programs for n-body trajector- ies and interplanetary trajectories},
  author = {Coffin, T. and De Vries, J. P.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19650021410},
  note = {Source identifier: 19650021410}
}