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Since its launch in October 2002, the INTEGRAL observatory has improved our knowledge of the hard X-ray sky above 20 keV, carrying out more than ten years of observations in the energy range from 5 keV to 8 MeV. The most recently published INTEGRAL/IBIS surveys listed more than seven hundred sources in the 20-100 keV band. Most of these objects are either Active Galaxies (AGNs) or X-ray binaries; a fraction of both classes is made of highly absorbed sources, often associated with dim opticaldoi:10.14311/app.2014.01.0240 fatcat:pp7rwuezsfbpppmuqk7egylp3a