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2000AcApS..20..109Z - Acta Astrophys. Sinica, 20, 109-112 (2000)
Discovery of four new X-ray selected quasars and two new Seyfert galaxies from ROSAT sources.
ZHAO Y.-H., SHI J.-R. and ZHAO G.
Journal keyword(s):
Simbad objects: 6
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