A BeppoSAX observation of Her X-1 during the first main-on after an anomalous low-state: Evidence for rapid spin-downT. Oosterbroek, A. N. Parmar, M. Orlandini, A. Segreto, A. Santangelo and S. Del SordoA&A, 375 3 (2001) 922-926DOI: https://doi.org/10.1051/0004-6361:20010820