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- [1] SPECTRAL VARIABILITY OF THE OPTICAL COUNTERPART OF CYGNUS X-1 ASTRONOMICHESKII ZHURNAL, 1983, 60 (06): : 1041 - 1050
- [2] 3-COLOR PHOTOMETRY OF HDE 226868 - OPTICAL COUNTERPART OF CYGNUS X-1 ASTROPHYSICAL JOURNAL, 1976, 205 (03): : 855 - 860
- [7] On the orbital and physical parameters of the HDE 226868/Cygnus X-1 binary system Astrophysics and Space Science, 2008, 315 : 335 - 340