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1976Ap&SS..42..249F - Astrophys. Space Sci., 42, 249-254 (1976)
Copernicus observations of extragalactic X-ray sources.
FABIAN A.C., MITCHELL R.J., DAVISON P.J.N., CHARLES P.A. and CULHANE J.L.
Journal keyword(s):
Simbad objects: 1
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