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1981Natur.293..275N - Nature, 293, 275-277 (1981)
Hard X-ray spectrum of Cyg X-1.
NOLAN P.L., GRUBER D.E., KNIGHT F.K., MATTESON J.L., ROTHSCHILD R.E., MARSHALL F.E., LEVINE A.M. and PRIMINI F.A.
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Simbad objects: 2
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