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Article Contents
1 Introduction
2 The Mass-Luminosity relation in the ``thin disc" model
3 What can be wrong with this analysis?
4 Spectral distribution predicted for accretion discs
5 First possibility: Super-Eddington accretion rates
6 Second possibility: The Blue Bump is not emitted by gravitational release of energy
7 Third possibility: Completely non standard discs
8 Conclusion

Copyright ESO 2002
Published by EDP Sciences