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Article Contents
1 Introduction
2 The sample
3 Comparison of the optically bright and optically faint X-ray source samples
4 Photometric redshift technique applied to an X-ray selected sample
5 The properties of OFS with spectroscopic redshifts
6 X-ray-to-optical flux ratios
7 X-ray spectroscopy
8 X-ray absorbed QSOs
9 Ultra deep field
10 Conclusions
References

List of tables
List of figures

Copyright ESO 2005
Published by EDP Sciences