@misc{indiciae3573767cc064,
  title = {Navigation capability for an ion drive rendezvous with Halley's Comet},
  author = {Thornton, C. L. and Jacobson, R. A.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780047996},
  note = {Source identifier: 19780047996}
}