TY - JOUR AU - Marek Sikora AU - J. Kirk AU - Mitchell Begelman AU - P. Schneider BT - The Astrophysical Journal DA - 09/1987 DO - 10.1086/184980 PY - 1987 EP - L81 T2 - The Astrophysical Journal TI - Electron injection by relativistic protons in active galactic nuclei UR - http://articles.adsabs.harvard.edu/full/1987ApJ...320L..81S VL - 320 SN - 0004-637X ER -