@misc{indiciae431989b4c82c,
  title = {Electron injection by relativistic protons in active galactic nuclei},
  author = {Sikora, Marek and Kirk, John G. and Begelman, Mitchell C. and Schneider, Peter},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880024301},
  note = {Source identifier: 19880024301}
}