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1967ApJ...148L.129G - Astrophys. J., 148, L129-L132 (1967)
On the optical search for the X-ray sources Cyg X-1 and Cyg X-2.
GIACCONI R., GORENSTEIN P., GURSKY H., USHER P.D., WATERS J.R., SANDAGE A., OSMER P. and PEACH J.V.
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Simbad objects: 3
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