@misc{indiciae168ef8e37d56,
  title = {Space missions to comets},
  author = {Neugebauer, M. and Yeomans, D. K. and Brandt, J. C. and Hobbs, R. W.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800003722},
  note = {Source identifier: 19800003722}
}