@inproceedings{Grinberg:2011TZ, author = "Grinberg, Victoria and Marcu, Diana M. and Pottschmidt, Katja and Boeck, Moritz and Wilms, Joern and Cadolle Bel, Marion and Lohfink, Anne M. and FUERST, Felix and Hanke, Manfred and Nowak, Michael A and Markoff, Sera and Markowitz, Alex and Tomsick, John and Rodriguez, Jerome and Pooley, Guy G and Caballero, Isabel", title = "{Cygnus X-1: shedding light on the spectral variability of the hard state of black holes}", doi = "10.22323/1.115.0133", booktitle = "Proceedings of 8th INTEGRAL Workshop “The Restless Gamma-ray Universe” {\textemdash} PoS(INTEGRAL 2010)", year = 2011, volume = "115", pages = "133" }