Trevese, D.D.TreveseVagnetti, F.F.VagnettiZitelli, V.V.ZitelliPuccetti, SimonettaSimonettaPuccetti2020-09-172020-09-172007-10-01https://hdl.handle.net/20.500.13025/780The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October, 2006 at Xi'an Jioatong University, Xi'an, China. Edited by Luis C. Ho and Jian-Min Wang, p.722We present a medium-deep XMM-Newton X-ray survey in the field of SA57. We discuss X-ray properties of low-luminosity AGNs previously selected through their optical variability.http://adsabs.harvard.edu/abs/2007ASPC..373..722T2007ASPC..373..722T