TY  - RPRT
TI  - Active galactic nuclei make the cosmic X-ray background
AU  - Zdziarski, Andrzej A.
AU  - Zycki, Piotr T.
AU  - Krolik, Julian H.
PY  - 1993
UR  - https://ntrs.nasa.gov/citations/19930072112
ID  - 19930072112
ER  -