XMM-Newton observations of the Lockman Hole - V. Time variability of the brightest AGNS. Mateos, X. Barcons, F. J. Carrera, M. J. Page, M. T. Ceballos, G. Hasinger and A. C. FabianA&A, 473 1 (2007) 105-120DOI: https://doi.org/10.1051/0004-6361:20077909
