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1994MmSAI..65..417R - Mem. Soc. Astron. Ital., 65, 417-420 (1994)
EXOSAT observations of the ultra-soft X-ray binary 4U 1957+11.
RICCI D., ISRAEL G.L. and STELLA L.
Journal keyword(s):
Simbad objects: 5
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