INTEGRAL observations of the variability of OAO 1657-415 J. Barnstedt, R. Staubert, A. Santangelo, C. Ferrigno, D. Horns, D. Klochkov, P. Kretschmar, I. Kreykenbohm, A. Segreto and J. Wilms A&A, 486 1 (2008) 293-302 Published online: 15 May 2008 DOI: 10.1051/0004-6361:20078707