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1991BAAS...23.1439P - Bull. American Astron. Soc., 23, 1439 (1991)
Hard X-ray observations of Cygnus X-1 in the period 1986-1989.
PALMER D.M., COOK W.R., GRUNSFELD J.M., HEINDL W.A., PRINCE T.A. and SCHINDLER S.M.
Journal keyword(s):
Simbad objects: 2
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