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1981ApJ...246..231D - Astrophys. J., 246, 231-237 (1981)
Observations of SMC X-1 with the monitor proportional counter on the Einstein (HEAO 2) X-ray observatory: the pulse period and its history.
DARBRO W., GHOSH P., ELSNER R.F., WEISSKOPF M.C., SUTHERLAND P.G. and GRINDLAY J.E.
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Simbad objects: 4
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