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1993A&A...279L..21V - Astronomy and Astrophysics, volume 279, L21-24 (1993)
Further ROSAT measurements of the period of 4U 1820-30.
VAN DER KLIS M., HASINGER G., VERBUNT F., VAN PARADIJS J., BELLONI T. and LEWIN W.H.G.
Journal keyword(s):
Simbad objects: 4
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