Cygnus X-1: shedding light on the spectral variability of the hard state of black holes
V. Grinberg*, D.M. Marcu, K. Pottschmidt, M. Boeck, J. Wilms, M. Cadolle Bel, A.M. Lohfink, F. Fuerst, M. Hanke, M.A. Nowak, S. Markoff, A. Markowitz, J. Tomsick, J. Rodriguez, G.G. Pooley and I. Caballero
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