ברבור X-1
הערות שוליים

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1 2  Diego F. Torres, Gustavo E. Romero, Xavier Barcons, Youjun Lu, Probing the precession of the inner accretion disk in Cygnus X-1, The Astrophysical Journal 626, 2005-06-20, עמ' 1015–1019 doi: 10.1086/430125
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1 2  J. M. Miller, P. Wojdowski, N. S. Schulz, H. L. Marshall, Revealing the Focused Companion Wind in Cygnus X-1 with Chandra, The Astrophysical Journal 620, 2005-02-10, עמ' 398–404 doi: 10.1086/426701
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↑  Black Hole Apocalypse, ‏February 4th 2018