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1974ApJ...189..339U - Astrophys. J., 189, 339-341 (1974)
Long-term observations of Cygnus X-2 from OSO-7.
ULMER M.P., SAMMULI A., BAITY W.A., WHEATON W.A. and PETERSON L.E.
Journal keyword(s):
Simbad objects: 2
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