Multifrequency observations of CYG X-2: X ray observations with GINGA First Author: Hasinger, Guenther In its Observations of Cygnus X-2 at X Ray, UV, Optical and Radio Frequencies p 1-45 (SEE N90-24191 17-89) Publication Date: Oct 1989 ADS bibliographic code: 1989STIN...9024192H Citations: 0