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The long-term X-ray spectral variability of AGN |
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| Authors: | M A Sobolewska I E Papadakis |
| Institution: | Foundation for Research and Technology-Hellas, IESL, Voutes, 71110 Heraklion, Crete, Greece;University of Crete, Department of Physics, Voutes, 71003 Heraklion, Crete, Greece |
| Abstract: | |
| Keywords: | galaxies: active X-rays: galaxies accretion accretion discs |