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Article Contents
1 Introduction
2 The samples
3 The optical classification criteria
4 X-ray spectral analysis
5 Optical obscuration versus X-ray absorption
6 X-ray bright optically normal galaxies (XBONG)
7 Type II QSO candidates
8 Summary and conclusions
Online Material
Appendix A: Illustrating figures about selection effects in our sample

List of tables
List of figures

Copyright ESO 2007
Published by EDP Sciences