XMM-Newton/2dF survey. II.
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https://b2find.eudat.eu/dataset/71286483-4502-57e5-b93e-f720142fcd36
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In this paper we investigate the properties of low X-ray-to-optical flux ratio sources detected in a wide-area (2.5{deg}^2^) shallow [fX(0.5-8keV)~10^-14^erg/s/cm^2^] XMM-Newton...
