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Cygnus X-3 transition from the ultrasoft to the hard state

V. Beckmann, S. Soldi, G. Bélanger, S. Brandt, M. D. Caballero-García, G. De Cesare, N. Gehrels, S. Grebenev, O. Vilhu, A. von Kienlin and T. J.-L. Courvoisier
A&A, 473 3 (2007) 903-905
DOI: 10.1051/0004-6361:20078160

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