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1998AN....319...72S - Astron. Nachr., 319, 72 (1998)
Optical spectroscopy of faint X-ray sources in the Lockman Hole.
SCHMIDT M., HASINGER G., GUNN J., SCHNEIDER D., BURG R., GIACCONI R., LEHMANN I., MacKENTY J., TRUEMPER J. and ZAMORANI G.
Journal keyword(s):
Simbad objects: 1
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