@misc{indiciae21452dd0d112,
  title = {The International Cometary Explorer comet encounter and earth-return trajectory},
  author = {Roberts, Craig E. and Dunham, David W. and Farquhar, Robert W.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900056478},
  note = {Source identifier: 19900056478}
}