TY - ECHAP AU - Mitchell Begelman CY - Dordrecht DO - 10.1007/978-94-011-1882-8_21 M1 - Astrophysics and Space Science Library PB - Springer Netherlands PP - Dordrecht PY - 1993 SN - 978-0-7923-2541-3/0067-0057 SP - 369 EP - 382 TI - Energy Input from AGNs VL - 188 ER -