Back to the Abstract

	1 Introduction
	2 Optically elusive AGN candidates in the XBS survey
	3 X-ray spectral analysis
	4 Why are they hidden in the optical?
	5 Summary and conclusions
	References
	Online Material
	Appendix A: The reliability of the fluxes derived from the optical spectra
	Appendix B: Notes on individual sources

	List of tables
	List of figures