@misc{indiciaea72d8bcb1a18,
  title = {Combined first- and second-order Fermi acceleration in cometary environments},
  author = {Gombosi, T. I. and Lorencz, K. and Jokipii, J. R.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900029426},
  note = {Source identifier: 19900029426}
}