@misc{indiciae5d1a43cf4a89,
  title = {Combined first and second order Fermi acceleration at comets},
  author = {Gombosi, T. I. and Lorencz, K. and Jokipii, J. R.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890057106},
  note = {Source identifier: 19890057106}
}