A torque reversal of 4U 1907+09 S. Fritz, I. Kreykenbohm, J. Wilms, R. Staubert, F. Bayazit, K. Pottschmidt, J. Rodriguez and A. Santangelo A&A, 458 3 (2006) 885-893 Published online: 12 September 2006 DOI: 10.1051/0004-6361:20065557