@misc{indiciaecab3989ac16b,
  title = {X-ray ionization and the Orion molecular cloud},
  author = {Krolik, J. H. and Kallman, T. R.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19830050196},
  note = {Source identifier: 19830050196}
}