[1]
Karitskaya, E. и др. 2007. The high-resolution optical spectroscopy as a method of X-ray binary CYG X-1 investigation. The results of CYG X-1 monitoring during 2002-2004. Известия Крымской астрофизической обсерватории. 103, 3 (июл. 2007), 152–152.