共 50 条
- [4] OPTICAL AND X-RAY-PROPERTIES OF X-RAY SELECTED ACTIVE GALACTIC NUCLEI ASTROPHYSICAL JOURNAL, 1982, 261 (01): : 51 - &
- [5] Are optically selected quasars universally X-ray luminous? X-ray-UV relations in Sloan Digital Sky Survey quasars ASTROPHYSICAL JOURNAL, 2008, 685 (02): : 773 - 786
- [6] The soft X-ray properties of a complete sample of optically selected quasars .2. Final results ASTROPHYSICAL JOURNAL, 1997, 477 (01): : 93 - 113
- [7] OPTICAL AND X-RAY OBSERVATIONS OF FAINT QUASARS IN AN OPTICALLY SELECTED SAMPLE ASTROPHYSICAL JOURNAL, 1983, 269 (01): : 42 - 48
- [9] The X-ray properties of optically selected galaxy clusters ASTROPHYSICAL JOURNAL, 2007, 658 (02): : 917 - 928