@misc{indiciae0a536186029d,
  title = {Electron impact ionization in the vicinity of comets},
  author = {Cravens, T. E. and Kozyra, J. U. and Nagy, A. F. and Gombosi, T. I. and Kurtz, M.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870060938},
  note = {Source identifier: 19870060938}
}