INTEGRAL observations of Hercules X-1 D. Klochkov, R. Staubert, K. Postnov, N. Shakura, A. Santangelo, S. Tsygankov, A. Lutovinov, I. Kreykenbohm and J. Wilms A&A, 482 3 (2008) 907-915 Published online: 20 February 2008 DOI: 10.1051/0004-6361:20078953