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1988ApJ...331..764H - Astrophys. J., 331, 764-772 (1988/August-0)
Discovery of a 4.2 hour X-ray period in GX 9+9.
HERTZ P. and WOOD K.S.
Abstract (from CDS):
Abstract Copyright: ∼
Journal keyword(s): Stars: Individual Alphanumeric: GX 9+9 - X-Rays: Binaries
Simbad objects: 5
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