共 50 条
- [1] HEAO-1 OBSERVATIONS OF HIGH-ENERGY X-RAYS FROM THE SEYFERT 1 GALAXY MKN 509 ASTROPHYSICAL JOURNAL, 1981, 250 (02): : 513 - 516
- [3] HIGH-ENERGY X-RAYS FROM CENTAURUS BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1971, 16 (04): : 534 - &
- [4] X-RAYS FROM THE QUASAR 3C-273 BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1979, 24 (04): : 620 - 620
- [7] HEAO-1 HIGH-ENERGY X-RAY OBSERVATIONS OF CENTAURUS-X-3 ASTROPHYSICAL JOURNAL, 1983, 272 (02): : 678 - 686
- [10] Spectral variability in hard X-rays and the evidence for a 13.5 years period in the bright quasar 3C273 Journal of Astrophysics and Astronomy, 2002, 23 : 243 - 258