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Article Contents
1 Introduction
2 The ICRF and its two extensions, ICRF-Ext.1 and ICRF-Ext.2
3 Quasar catalogs at optical wavelengths
4 Cross-identification between ICRF and catalogs of quasars
5 Photometric properties of the ICRF quasars
6 About the sky coverage of the ICRF quasars and other catalogs
7 Conclusion

List of tables
List of figures

Copyright ESO 2006
Published by EDP Sciences