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- [6] EVIDENCE FOR AN INTERMEDIATE-MASS BLACK HOLE IN NGC 5408 X-1 ASTROPHYSICAL JOURNAL, 2009, 703 (02): : 1386 - 1393
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- [9] Determination of black hole mass in Cygnus X-1 by scaling of spectral index-QPO frequency correlation ASTROPHYSICAL JOURNAL, 2007, 663 (01): : 445 - 449
- [10] Scaling of X-ray spectral properties of a black hole in the Seyfert 1 galaxy NGC 7469 ASTRONOMY & ASTROPHYSICS, 2018, 619