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1978Natur.275..624M - Nature, 275, 624-625 (1978)
N galaxies, a new class of X-ray sources.
MARSHALL F.E., MUSHOTZKY R.F., BOLDT E.A., HOLT S.S., ROTHSCHILD R.E. and SERLEMITSOS P.J.
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Simbad objects: 3
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